#region License
/* SDL2# - C# Wrapper for SDL2
 *
 * Copyright (c) 2013-2020 Ethan Lee.
 *
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from
 * the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software in a
 * product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * Ethan "flibitijibibo" Lee <flibitijibibo@flibitijibibo.com>
 *
 */
#endregion

#region Using Statements
using System;
using System.Runtime.InteropServices;
#endregion

namespace SDL2
{
    public static partial class SDL
    {
        #region SDL2# Variables

        private const string nativeLibName = "SDL2";

        #endregion

        #region UTF8 Marshaling

        internal static byte[] UTF8_ToNative(string s)
        {
            if (s == null)
            {
                return null;
            }

            // Add a null terminator. That's kind of it... :/
            return System.Text.Encoding.UTF8.GetBytes(s + '\0');
        }

        /* This is public because SDL_DropEvent needs it! */
        public static unsafe string UTF8_ToManaged(IntPtr s, bool freePtr = false)
        {
            if (s == IntPtr.Zero)
            {
                return null;
            }

            /* We get to do strlen ourselves! */
            byte* ptr = (byte*)s;
            while (*ptr != 0)
            {
                ptr++;
            }

            /* TODO: This #ifdef is only here because the equivalent
			 * .NET 2.0 constructor appears to be less efficient?
			 * Here's the pretty version, maybe steal this instead:
			 *
			string result = new string(
				(sbyte*) s, // Also, why sbyte???
				0,
				(int) (ptr - (byte*) s),
				System.Text.Encoding.UTF8
			);
			 * See the CoreCLR source for more info.
			 * -flibit
			 */
#if NETSTANDARD2_0
            /* Modern C# lets you just send the byte*, nice! */
            string result = System.Text.Encoding.UTF8.GetString(
                (byte*)s,
                (int)(ptr - (byte*)s)
            );
#else
			/* Old C# requires an extra memcpy, bleh! */
			int len = (int) (ptr - (byte*) s);
			if (len == 0)
			{
				return string.Empty;
			}
			char* chars = stackalloc char[len];
			int strLen = System.Text.Encoding.UTF8.GetChars((byte*) s, len, chars, len);
			string result = new string(chars, 0, strLen);
#endif

            /* Some SDL functions will malloc, we have to free! */
            if (freePtr)
            {
                SDL_free(s);
            }
            return result;
        }

        #endregion

        #region SDL_stdinc.h

        public static uint SDL_FOURCC(byte A, byte B, byte C, byte D)
        {
            return (uint)(A | (B << 8) | (C << 16) | (D << 24));
        }

        public enum SDL_bool
        {
            SDL_FALSE = 0,
            SDL_TRUE = 1
        }

        /* malloc/free are used by the marshaler! -flibit */

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        internal static extern IntPtr SDL_malloc(IntPtr size);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        internal static extern void SDL_free(IntPtr memblock);

        /* Buffer.BlockCopy is not available in every runtime yet. Also,
		 * using memcpy directly can be a compatibility issue in other
		 * strange ways. So, we expose this to get around all that.
		 * -flibit
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_memcpy(IntPtr dst, IntPtr src, IntPtr len);

        #endregion

        #region SDL_rwops.h

        public const int RW_SEEK_SET = 0;
        public const int RW_SEEK_CUR = 1;
        public const int RW_SEEK_END = 2;

        public const UInt32 SDL_RWOPS_UNKNOWN = 0; /* Unknown stream type */
        public const UInt32 SDL_RWOPS_WINFILE = 1; /* Win32 file */
        public const UInt32 SDL_RWOPS_STDFILE = 2; /* Stdio file */
        public const UInt32 SDL_RWOPS_JNIFILE = 3; /* Android asset */
        public const UInt32 SDL_RWOPS_MEMORY = 4; /* Memory stream */
        public const UInt32 SDL_RWOPS_MEMORY_RO = 5; /* Read-Only memory stream */

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate long SDLRWopsSizeCallback(IntPtr context);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate long SDLRWopsSeekCallback(
            IntPtr context,
            long offset,
            int whence
        );

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate IntPtr SDLRWopsReadCallback(
            IntPtr context,
            IntPtr ptr,
            IntPtr size,
            IntPtr maxnum
        );

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate IntPtr SDLRWopsWriteCallback(
            IntPtr context,
            IntPtr ptr,
            IntPtr size,
            IntPtr num
        );

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate int SDLRWopsCloseCallback(
            IntPtr context
        );

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_RWops
        {
            public IntPtr size;
            public IntPtr seek;
            public IntPtr read;
            public IntPtr write;
            public IntPtr close;

            public UInt32 type;

            /* NOTE: This isn't the full structure since
			 * the native SDL_RWops contains a hidden union full of
			 * internal information and platform-specific stuff depending
			 * on what conditions the native library was built with
			 */
        }

        /* IntPtr refers to an SDL_RWops* */
        [DllImport(nativeLibName, EntryPoint = "SDL_RWFromFile", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_RWFromFile(
            byte[] file,
            byte[] mode
        );
        public static IntPtr SDL_RWFromFile(
            string file,
            string mode
        )
        {
            return INTERNAL_SDL_RWFromFile(
                UTF8_ToNative(file),
                UTF8_ToNative(mode)
            );
        }

        /* IntPtr refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_AllocRW();

        /* area refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeRW(IntPtr area);

        /* fp refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_RWFromFP(IntPtr fp, SDL_bool autoclose);

        /* mem refers to a void*, IntPtr to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_RWFromMem(IntPtr mem, int size);

        /* mem refers to a const void*, IntPtr to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_RWFromConstMem(IntPtr mem, int size);

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWsize(IntPtr context);

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWseek(
            IntPtr context,
            long offset,
            int whence
        );

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWtell(IntPtr context);

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops*, ptr refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWread(
            IntPtr context,
            IntPtr ptr,
            IntPtr size,
            IntPtr maxnum
        );

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops*, ptr refers to a const void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWwrite(
            IntPtr context,
            IntPtr ptr,
            IntPtr size,
            IntPtr maxnum
        );

        /* Read endian functions */

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern byte SDL_ReadU8(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt16 SDL_ReadLE16(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt16 SDL_ReadBE16(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_ReadLE32(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_ReadBE32(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt64 SDL_ReadLE64(IntPtr src);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt64 SDL_ReadBE64(IntPtr src);

        /* Write endian functions */

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteU8(IntPtr dst, byte value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteLE16(IntPtr dst, UInt16 value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteBE16(IntPtr dst, UInt16 value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteLE32(IntPtr dst, UInt32 value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteBE32(IntPtr dst, UInt32 value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteLE64(IntPtr dst, UInt64 value);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WriteBE64(IntPtr dst, UInt64 value);

        /* Only available in SDL 2.0.10 or higher. */
        /* context refers to an SDL_RWops* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_RWclose(IntPtr context);

        /* Only available in SDL 2.0.10 or higher. */
        /* file refers to a const char*
		 * datasize refers to a size_t*
		 * IntPtr refers to a void*
		*/
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_LoadFile(IntPtr file, IntPtr datasize);

        #endregion

        #region SDL_main.h

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetMainReady();

        /* This is used as a function pointer to a C main() function */
        public delegate int SDL_main_func(int argc, IntPtr argv);

        /* Use this function with UWP to call your C# Main() function! */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_WinRTRunApp(
            SDL_main_func mainFunction,
            IntPtr reserved
        );

        /* Use this function with iOS to call your C# Main() function!
		 * Only available in SDL 2.0.10 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UIKitRunApp(
            int argc,
            IntPtr argv,
            SDL_main_func mainFunction
        );

        #endregion

        #region SDL.h

        public const uint SDL_INIT_TIMER = 0x00000001;
        public const uint SDL_INIT_AUDIO = 0x00000010;
        public const uint SDL_INIT_VIDEO = 0x00000020;
        public const uint SDL_INIT_JOYSTICK = 0x00000200;
        public const uint SDL_INIT_HAPTIC = 0x00001000;
        public const uint SDL_INIT_GAMECONTROLLER = 0x00002000;
        public const uint SDL_INIT_EVENTS = 0x00004000;
        public const uint SDL_INIT_SENSOR = 0x00008000;
        public const uint SDL_INIT_NOPARACHUTE = 0x00100000;
        public const uint SDL_INIT_EVERYTHING = (
            SDL_INIT_TIMER | SDL_INIT_AUDIO | SDL_INIT_VIDEO |
            SDL_INIT_EVENTS | SDL_INIT_JOYSTICK | SDL_INIT_HAPTIC |
            SDL_INIT_GAMECONTROLLER | SDL_INIT_SENSOR
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_Init(uint flags);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_InitSubSystem(uint flags);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_Quit();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_QuitSubSystem(uint flags);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_WasInit(uint flags);

        #endregion

        #region SDL_platform.h

        [DllImport(nativeLibName, EntryPoint = "SDL_GetPlatform", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetPlatform();
        public static string SDL_GetPlatform()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetPlatform());
        }

        #endregion

        #region SDL_hints.h

        public const string SDL_HINT_FRAMEBUFFER_ACCELERATION =
            "SDL_FRAMEBUFFER_ACCELERATION";
        public const string SDL_HINT_RENDER_DRIVER =
            "SDL_RENDER_DRIVER";
        public const string SDL_HINT_RENDER_OPENGL_SHADERS =
            "SDL_RENDER_OPENGL_SHADERS";
        public const string SDL_HINT_RENDER_DIRECT3D_THREADSAFE =
            "SDL_RENDER_DIRECT3D_THREADSAFE";
        public const string SDL_HINT_RENDER_VSYNC =
            "SDL_RENDER_VSYNC";
        public const string SDL_HINT_VIDEO_X11_XVIDMODE =
            "SDL_VIDEO_X11_XVIDMODE";
        public const string SDL_HINT_VIDEO_X11_XINERAMA =
            "SDL_VIDEO_X11_XINERAMA";
        public const string SDL_HINT_VIDEO_X11_XRANDR =
            "SDL_VIDEO_X11_XRANDR";
        public const string SDL_HINT_GRAB_KEYBOARD =
            "SDL_GRAB_KEYBOARD";
        public const string SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS =
            "SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS";
        public const string SDL_HINT_IDLE_TIMER_DISABLED =
            "SDL_IOS_IDLE_TIMER_DISABLED";
        public const string SDL_HINT_ORIENTATIONS =
            "SDL_IOS_ORIENTATIONS";
        public const string SDL_HINT_XINPUT_ENABLED =
            "SDL_XINPUT_ENABLED";
        public const string SDL_HINT_GAMECONTROLLERCONFIG =
            "SDL_GAMECONTROLLERCONFIG";
        public const string SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS =
            "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS";
        public const string SDL_HINT_ALLOW_TOPMOST =
            "SDL_ALLOW_TOPMOST";
        public const string SDL_HINT_TIMER_RESOLUTION =
            "SDL_TIMER_RESOLUTION";
        public const string SDL_HINT_RENDER_SCALE_QUALITY =
            "SDL_RENDER_SCALE_QUALITY";

        /* Only available in SDL 2.0.1 or higher */
        public const string SDL_HINT_VIDEO_HIGHDPI_DISABLED =
            "SDL_VIDEO_HIGHDPI_DISABLED";

        /* Only available in SDL 2.0.2 or higher */
        public const string SDL_HINT_CTRL_CLICK_EMULATE_RIGHT_CLICK =
            "SDL_CTRL_CLICK_EMULATE_RIGHT_CLICK";
        public const string SDL_HINT_VIDEO_WIN_D3DCOMPILER =
            "SDL_VIDEO_WIN_D3DCOMPILER";
        public const string SDL_HINT_MOUSE_RELATIVE_MODE_WARP =
            "SDL_MOUSE_RELATIVE_MODE_WARP";
        public const string SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT =
            "SDL_VIDEO_WINDOW_SHARE_PIXEL_FORMAT";
        public const string SDL_HINT_VIDEO_ALLOW_SCREENSAVER =
            "SDL_VIDEO_ALLOW_SCREENSAVER";
        public const string SDL_HINT_ACCELEROMETER_AS_JOYSTICK =
            "SDL_ACCELEROMETER_AS_JOYSTICK";
        public const string SDL_HINT_VIDEO_MAC_FULLSCREEN_SPACES =
            "SDL_VIDEO_MAC_FULLSCREEN_SPACES";

        /* Only available in SDL 2.0.3 or higher */
        public const string SDL_HINT_WINRT_PRIVACY_POLICY_URL =
            "SDL_WINRT_PRIVACY_POLICY_URL";
        public const string SDL_HINT_WINRT_PRIVACY_POLICY_LABEL =
            "SDL_WINRT_PRIVACY_POLICY_LABEL";
        public const string SDL_HINT_WINRT_HANDLE_BACK_BUTTON =
            "SDL_WINRT_HANDLE_BACK_BUTTON";

        /* Only available in SDL 2.0.4 or higher */
        public const string SDL_HINT_NO_SIGNAL_HANDLERS =
            "SDL_NO_SIGNAL_HANDLERS";
        public const string SDL_HINT_IME_INTERNAL_EDITING =
            "SDL_IME_INTERNAL_EDITING";
        public const string SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH =
            "SDL_ANDROID_SEPARATE_MOUSE_AND_TOUCH";
        public const string SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT =
            "SDL_EMSCRIPTEN_KEYBOARD_ELEMENT";
        public const string SDL_HINT_THREAD_STACK_SIZE =
            "SDL_THREAD_STACK_SIZE";
        public const string SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN =
            "SDL_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN";
        public const string SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP =
            "SDL_WINDOWS_ENABLE_MESSAGELOOP";
        public const string SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4 =
            "SDL_WINDOWS_NO_CLOSE_ON_ALT_F4";
        public const string SDL_HINT_XINPUT_USE_OLD_JOYSTICK_MAPPING =
            "SDL_XINPUT_USE_OLD_JOYSTICK_MAPPING";
        public const string SDL_HINT_MAC_BACKGROUND_APP =
            "SDL_MAC_BACKGROUND_APP";
        public const string SDL_HINT_VIDEO_X11_NET_WM_PING =
            "SDL_VIDEO_X11_NET_WM_PING";
        public const string SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION =
            "SDL_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION";
        public const string SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION =
            "SDL_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION";

        /* Only available in 2.0.5 or higher */
        public const string SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH =
            "SDL_MOUSE_FOCUS_CLICKTHROUGH";
        public const string SDL_HINT_BMP_SAVE_LEGACY_FORMAT =
            "SDL_BMP_SAVE_LEGACY_FORMAT";
        public const string SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING =
            "SDL_WINDOWS_DISABLE_THREAD_NAMING";
        public const string SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION =
            "SDL_APPLE_TV_REMOTE_ALLOW_ROTATION";

        /* Only available in 2.0.6 or higher */
        public const string SDL_HINT_AUDIO_RESAMPLING_MODE =
            "SDL_AUDIO_RESAMPLING_MODE";
        public const string SDL_HINT_RENDER_LOGICAL_SIZE_MODE =
            "SDL_RENDER_LOGICAL_SIZE_MODE";
        public const string SDL_HINT_MOUSE_NORMAL_SPEED_SCALE =
            "SDL_MOUSE_NORMAL_SPEED_SCALE";
        public const string SDL_HINT_MOUSE_RELATIVE_SPEED_SCALE =
            "SDL_MOUSE_RELATIVE_SPEED_SCALE";
        public const string SDL_HINT_TOUCH_MOUSE_EVENTS =
            "SDL_TOUCH_MOUSE_EVENTS";
        public const string SDL_HINT_WINDOWS_INTRESOURCE_ICON =
            "SDL_WINDOWS_INTRESOURCE_ICON";
        public const string SDL_HINT_WINDOWS_INTRESOURCE_ICON_SMALL =
            "SDL_WINDOWS_INTRESOURCE_ICON_SMALL";

        /* Only available in 2.0.8 or higher */
        public const string SDL_HINT_IOS_HIDE_HOME_INDICATOR =
            "SDL_IOS_HIDE_HOME_INDICATOR";
        public const string SDL_HINT_TV_REMOTE_AS_JOYSTICK =
            "SDL_TV_REMOTE_AS_JOYSTICK";

        /* Only available in 2.0.9 or higher */
        public const string SDL_HINT_MOUSE_DOUBLE_CLICK_TIME =
            "SDL_MOUSE_DOUBLE_CLICK_TIME";
        public const string SDL_HINT_MOUSE_DOUBLE_CLICK_RADIUS =
            "SDL_MOUSE_DOUBLE_CLICK_RADIUS";
        public const string SDL_HINT_JOYSTICK_HIDAPI =
            "SDL_JOYSTICK_HIDAPI";
        public const string SDL_HINT_JOYSTICK_HIDAPI_PS4 =
            "SDL_JOYSTICK_HIDAPI_PS4";
        public const string SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE =
            "SDL_JOYSTICK_HIDAPI_PS4_RUMBLE";
        public const string SDL_HINT_JOYSTICK_HIDAPI_STEAM =
            "SDL_JOYSTICK_HIDAPI_STEAM";
        public const string SDL_HINT_JOYSTICK_HIDAPI_SWITCH =
            "SDL_JOYSTICK_HIDAPI_SWITCH";
        public const string SDL_HINT_JOYSTICK_HIDAPI_XBOX =
            "SDL_JOYSTICK_HIDAPI_XBOX";
        public const string SDL_HINT_ENABLE_STEAM_CONTROLLERS =
            "SDL_ENABLE_STEAM_CONTROLLERS";
        public const string SDL_HINT_ANDROID_TRAP_BACK_BUTTON =
            "SDL_ANDROID_TRAP_BACK_BUTTON";

        /* Only available in 2.0.10 or higher */
        public const string SDL_HINT_MOUSE_TOUCH_EVENTS =
            "SDL_MOUSE_TOUCH_EVENTS";
        public const string SDL_HINT_GAMECONTROLLERCONFIG_FILE =
            "SDL_GAMECONTROLLERCONFIG_FILE";
        public const string SDL_HINT_ANDROID_BLOCK_ON_PAUSE =
            "SDL_ANDROID_BLOCK_ON_PAUSE";
        public const string SDL_HINT_RENDER_BATCHING =
            "SDL_RENDER_BATCHING";
        public const string SDL_HINT_EVENT_LOGGING =
            "SDL_EVENT_LOGGING";
        public const string SDL_HINT_WAVE_RIFF_CHUNK_SIZE =
            "SDL_WAVE_RIFF_CHUNK_SIZE";
        public const string SDL_HINT_WAVE_TRUNCATION =
            "SDL_WAVE_TRUNCATION";
        public const string SDL_HINT_WAVE_FACT_CHUNK =
            "SDL_WAVE_FACT_CHUNK";

        public enum SDL_HintPriority
        {
            SDL_HINT_DEFAULT,
            SDL_HINT_NORMAL,
            SDL_HINT_OVERRIDE
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_ClearHints();

        [DllImport(nativeLibName, EntryPoint = "SDL_GetHint", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetHint(byte[] name);
        public static string SDL_GetHint(string name)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetHint(
                    UTF8_ToNative(name)
                )
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_SetHint", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_bool INTERNAL_SDL_SetHint(
            byte[] name,
            byte[] value
        );
        public static SDL_bool SDL_SetHint(string name, string value)
        {
            return INTERNAL_SDL_SetHint(
                UTF8_ToNative(name),
                UTF8_ToNative(value)
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_SetHintWithPriority", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_bool INTERNAL_SDL_SetHintWithPriority(
            byte[] name,
            byte[] value,
            SDL_HintPriority priority
        );
        public static SDL_bool SDL_SetHintWithPriority(
            string name,
            string value,
            SDL_HintPriority priority
        )
        {
            return INTERNAL_SDL_SetHintWithPriority(
                UTF8_ToNative(name),
                UTF8_ToNative(value),
                priority
            );
        }

        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetHintBoolean", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_bool INTERNAL_SDL_GetHintBoolean(
            byte[] name,
            SDL_bool default_value
        );
        public static SDL_bool SDL_GetHintBoolean(
            string name,
            SDL_bool default_value
        )
        {
            return INTERNAL_SDL_GetHintBoolean(
                UTF8_ToNative(name),
                default_value
            );
        }

        #endregion

        #region SDL_error.h

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_ClearError();

        [DllImport(nativeLibName, EntryPoint = "SDL_GetError", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetError();
        public static string SDL_GetError()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetError());
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_SetError", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_SetError(byte[] fmtAndArglist);
        public static void SDL_SetError(string fmtAndArglist)
        {
            INTERNAL_SDL_SetError(
                UTF8_ToNative(fmtAndArglist)
            );
        }

        #endregion

        #region SDL_log.h

        /* Begin nameless enum SDL_LOG_CATEGORY */
        public const int SDL_LOG_CATEGORY_APPLICATION = 0;
        public const int SDL_LOG_CATEGORY_ERROR = 1;
        public const int SDL_LOG_CATEGORY_ASSERT = 2;
        public const int SDL_LOG_CATEGORY_SYSTEM = 3;
        public const int SDL_LOG_CATEGORY_AUDIO = 4;
        public const int SDL_LOG_CATEGORY_VIDEO = 5;
        public const int SDL_LOG_CATEGORY_RENDER = 6;
        public const int SDL_LOG_CATEGORY_INPUT = 7;
        public const int SDL_LOG_CATEGORY_TEST = 8;

        /* Reserved for future SDL library use */
        public const int SDL_LOG_CATEGORY_RESERVED1 = 9;
        public const int SDL_LOG_CATEGORY_RESERVED2 = 10;
        public const int SDL_LOG_CATEGORY_RESERVED3 = 11;
        public const int SDL_LOG_CATEGORY_RESERVED4 = 12;
        public const int SDL_LOG_CATEGORY_RESERVED5 = 13;
        public const int SDL_LOG_CATEGORY_RESERVED6 = 14;
        public const int SDL_LOG_CATEGORY_RESERVED7 = 15;
        public const int SDL_LOG_CATEGORY_RESERVED8 = 16;
        public const int SDL_LOG_CATEGORY_RESERVED9 = 17;
        public const int SDL_LOG_CATEGORY_RESERVED10 = 18;

        /* Beyond this point is reserved for application use, e.g.
			enum {
				LOG_CATEGORY_AWESOME1 = SDL_LOG_CATEGORY_CUSTOM,
				LOG_CATEGORY_AWESOME2,
				LOG_CATEGORY_AWESOME3,
				...
			};
		*/
        public const int SDL_LOG_CATEGORY_CUSTOM = 19;
        /* End nameless enum SDL_LOG_CATEGORY */

        public enum SDL_LogPriority
        {
            SDL_LOG_PRIORITY_VERBOSE = 1,
            SDL_LOG_PRIORITY_DEBUG,
            SDL_LOG_PRIORITY_INFO,
            SDL_LOG_PRIORITY_WARN,
            SDL_LOG_PRIORITY_ERROR,
            SDL_LOG_PRIORITY_CRITICAL,
            SDL_NUM_LOG_PRIORITIES
        }

        /* userdata refers to a void*, message to a const char* */
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate void SDL_LogOutputFunction(
            IntPtr userdata,
            int category,
            SDL_LogPriority priority,
            IntPtr message
        );

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_Log", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_Log(byte[] fmtAndArglist);
        public static void SDL_Log(string fmtAndArglist)
        {
            INTERNAL_SDL_Log(
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogVerbose", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogVerbose(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogVerbose(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogVerbose(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogDebug", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogDebug(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogDebug(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogDebug(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogInfo", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogInfo(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogInfo(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogInfo(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogWarn", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogWarn(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogWarn(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogWarn(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogError", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogError(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogError(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogError(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogCritical", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogCritical(
            int category,
            byte[] fmtAndArglist
        );
        public static void SDL_LogCritical(
            int category,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogCritical(
                category,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogMessage", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogMessage(
            int category,
            SDL_LogPriority priority,
            byte[] fmtAndArglist
        );
        public static void SDL_LogMessage(
            int category,
            SDL_LogPriority priority,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogMessage(
                category,
                priority,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        /* Use string.Format for arglists */
        [DllImport(nativeLibName, EntryPoint = "SDL_LogMessageV", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_LogMessageV(
            int category,
            SDL_LogPriority priority,
            byte[] fmtAndArglist
        );
        public static void SDL_LogMessageV(
            int category,
            SDL_LogPriority priority,
            string fmtAndArglist
        )
        {
            INTERNAL_SDL_LogMessageV(
                category,
                priority,
                UTF8_ToNative(fmtAndArglist)
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_LogPriority SDL_LogGetPriority(
            int category
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LogSetPriority(
            int category,
            SDL_LogPriority priority
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LogSetAllPriority(
            SDL_LogPriority priority
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LogResetPriorities();

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        private static extern void SDL_LogGetOutputFunction(
            out IntPtr callback,
            out IntPtr userdata
        );
        public static void SDL_LogGetOutputFunction(
            out SDL_LogOutputFunction callback,
            out IntPtr userdata
        )
        {
            IntPtr result = IntPtr.Zero;
            SDL_LogGetOutputFunction(
                out result,
                out userdata
            );
            if (result != IntPtr.Zero)
            {
                callback = (SDL_LogOutputFunction)Marshal.GetDelegateForFunctionPointer(
                    result,
                    typeof(SDL_LogOutputFunction)
                );
            }
            else
            {
                callback = null;
            }
        }

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LogSetOutputFunction(
            SDL_LogOutputFunction callback,
            IntPtr userdata
        );

        #endregion

        #region SDL_messagebox.h

        [Flags]
        public enum SDL_MessageBoxFlags : uint
        {
            SDL_MESSAGEBOX_ERROR = 0x00000010,
            SDL_MESSAGEBOX_WARNING = 0x00000020,
            SDL_MESSAGEBOX_INFORMATION = 0x00000040
        }

        [Flags]
        public enum SDL_MessageBoxButtonFlags : uint
        {
            SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT = 0x00000001,
            SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT = 0x00000002
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct INTERNAL_SDL_MessageBoxButtonData
        {
            public SDL_MessageBoxButtonFlags flags;
            public int buttonid;
            public IntPtr text; /* The UTF-8 button text */
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MessageBoxButtonData
        {
            public SDL_MessageBoxButtonFlags flags;
            public int buttonid;
            public string text; /* The UTF-8 button text */
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MessageBoxColor
        {
            public byte r, g, b;
        }

        public enum SDL_MessageBoxColorType
        {
            SDL_MESSAGEBOX_COLOR_BACKGROUND,
            SDL_MESSAGEBOX_COLOR_TEXT,
            SDL_MESSAGEBOX_COLOR_BUTTON_BORDER,
            SDL_MESSAGEBOX_COLOR_BUTTON_BACKGROUND,
            SDL_MESSAGEBOX_COLOR_BUTTON_SELECTED,
            SDL_MESSAGEBOX_COLOR_MAX
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MessageBoxColorScheme
        {
            [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = (int)SDL_MessageBoxColorType.SDL_MESSAGEBOX_COLOR_MAX)]
            public SDL_MessageBoxColor[] colors;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct INTERNAL_SDL_MessageBoxData
        {
            public SDL_MessageBoxFlags flags;
            public IntPtr window;               /* Parent window, can be NULL */
            public IntPtr title;                /* UTF-8 title */
            public IntPtr message;              /* UTF-8 message text */
            public int numbuttons;
            public IntPtr buttons;
            public IntPtr colorScheme;          /* Can be NULL to use system settings */
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MessageBoxData
        {
            public SDL_MessageBoxFlags flags;
            public IntPtr window;               /* Parent window, can be NULL */
            public string title;                /* UTF-8 title */
            public string message;              /* UTF-8 message text */
            public int numbuttons;
            public SDL_MessageBoxButtonData[] buttons;
            public SDL_MessageBoxColorScheme? colorScheme;  /* Can be NULL to use system settings */
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_ShowMessageBox", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_ShowMessageBox([In()] ref INTERNAL_SDL_MessageBoxData messageboxdata, out int buttonid);

        /* Ripped from Jameson's LpUtf8StrMarshaler */
        private static IntPtr INTERNAL_AllocUTF8(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return IntPtr.Zero;
            }
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(str + '\0');
            IntPtr mem = SDL.SDL_malloc((IntPtr)bytes.Length);
            Marshal.Copy(bytes, 0, mem, bytes.Length);
            return mem;
        }

        public static unsafe int SDL_ShowMessageBox([In()] ref SDL_MessageBoxData messageboxdata, out int buttonid)
        {
            var data = new INTERNAL_SDL_MessageBoxData()
            {
                flags = messageboxdata.flags,
                window = messageboxdata.window,
                title = INTERNAL_AllocUTF8(messageboxdata.title),
                message = INTERNAL_AllocUTF8(messageboxdata.message),
                numbuttons = messageboxdata.numbuttons,
            };

            var buttons = new INTERNAL_SDL_MessageBoxButtonData[messageboxdata.numbuttons];
            for (int i = 0; i < messageboxdata.numbuttons; i++)
            {
                buttons[i] = new INTERNAL_SDL_MessageBoxButtonData()
                {
                    flags = messageboxdata.buttons[i].flags,
                    buttonid = messageboxdata.buttons[i].buttonid,
                    text = INTERNAL_AllocUTF8(messageboxdata.buttons[i].text),
                };
            }

            if (messageboxdata.colorScheme != null)
            {
                data.colorScheme = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SDL_MessageBoxColorScheme)));
                Marshal.StructureToPtr(messageboxdata.colorScheme.Value, data.colorScheme, false);
            }

            int result;
            fixed (INTERNAL_SDL_MessageBoxButtonData* buttonsPtr = &buttons[0])
            {
                data.buttons = (IntPtr)buttonsPtr;
                result = INTERNAL_SDL_ShowMessageBox(ref data, out buttonid);
            }

            Marshal.FreeHGlobal(data.colorScheme);
            for (int i = 0; i < messageboxdata.numbuttons; i++)
            {
                SDL_free(buttons[i].text);
            }
            SDL_free(data.message);
            SDL_free(data.title);

            return result;
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, EntryPoint = "SDL_ShowSimpleMessageBox", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_ShowSimpleMessageBox(
            SDL_MessageBoxFlags flags,
            byte[] title,
            byte[] message,
            IntPtr window
        );
        public static int SDL_ShowSimpleMessageBox(
            SDL_MessageBoxFlags flags,
            string title,
            string message,
            IntPtr window
        )
        {
            return INTERNAL_SDL_ShowSimpleMessageBox(
                flags,
                UTF8_ToNative(title),
                UTF8_ToNative(message),
                window
            );
        }

        #endregion

        #region SDL_version.h, SDL_revision.h

        /* Similar to the headers, this is the version we're expecting to be
		 * running with. You will likely want to check this somewhere in your
		 * program!
		 */
        public const int SDL_MAJOR_VERSION = 2;
        public const int SDL_MINOR_VERSION = 0;
        public const int SDL_PATCHLEVEL = 10;

        public static readonly int SDL_COMPILEDVERSION = SDL_VERSIONNUM(
            SDL_MAJOR_VERSION,
            SDL_MINOR_VERSION,
            SDL_PATCHLEVEL
        );

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_version
        {
            public byte major;
            public byte minor;
            public byte patch;
        }

        public static void SDL_VERSION(out SDL_version x)
        {
            x.major = SDL_MAJOR_VERSION;
            x.minor = SDL_MINOR_VERSION;
            x.patch = SDL_PATCHLEVEL;
        }

        public static int SDL_VERSIONNUM(int X, int Y, int Z)
        {
            return (X * 1000) + (Y * 100) + Z;
        }

        public static bool SDL_VERSION_ATLEAST(int X, int Y, int Z)
        {
            return (SDL_COMPILEDVERSION >= SDL_VERSIONNUM(X, Y, Z));
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetVersion(out SDL_version ver);

        [DllImport(nativeLibName, EntryPoint = "SDL_GetRevision", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetRevision();
        public static string SDL_GetRevision()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetRevision());
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRevisionNumber();

        #endregion

        #region SDL_video.h

        public enum SDL_GLattr
        {
            SDL_GL_RED_SIZE,
            SDL_GL_GREEN_SIZE,
            SDL_GL_BLUE_SIZE,
            SDL_GL_ALPHA_SIZE,
            SDL_GL_BUFFER_SIZE,
            SDL_GL_DOUBLEBUFFER,
            SDL_GL_DEPTH_SIZE,
            SDL_GL_STENCIL_SIZE,
            SDL_GL_ACCUM_RED_SIZE,
            SDL_GL_ACCUM_GREEN_SIZE,
            SDL_GL_ACCUM_BLUE_SIZE,
            SDL_GL_ACCUM_ALPHA_SIZE,
            SDL_GL_STEREO,
            SDL_GL_MULTISAMPLEBUFFERS,
            SDL_GL_MULTISAMPLESAMPLES,
            SDL_GL_ACCELERATED_VISUAL,
            SDL_GL_RETAINED_BACKING,
            SDL_GL_CONTEXT_MAJOR_VERSION,
            SDL_GL_CONTEXT_MINOR_VERSION,
            SDL_GL_CONTEXT_EGL,
            SDL_GL_CONTEXT_FLAGS,
            SDL_GL_CONTEXT_PROFILE_MASK,
            SDL_GL_SHARE_WITH_CURRENT_CONTEXT,
            SDL_GL_FRAMEBUFFER_SRGB_CAPABLE,
            SDL_GL_CONTEXT_RELEASE_BEHAVIOR,
            SDL_GL_CONTEXT_RESET_NOTIFICATION,  /* Only available in 2.0.6 */
            SDL_GL_CONTEXT_NO_ERROR,        /* Only available in 2.0.6 */
        }

        [Flags]
        public enum SDL_GLprofile
        {
            SDL_GL_CONTEXT_PROFILE_CORE = 0x0001,
            SDL_GL_CONTEXT_PROFILE_COMPATIBILITY = 0x0002,
            SDL_GL_CONTEXT_PROFILE_ES = 0x0004
        }

        [Flags]
        public enum SDL_GLcontext
        {
            SDL_GL_CONTEXT_DEBUG_FLAG = 0x0001,
            SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG = 0x0002,
            SDL_GL_CONTEXT_ROBUST_ACCESS_FLAG = 0x0004,
            SDL_GL_CONTEXT_RESET_ISOLATION_FLAG = 0x0008
        }

        public enum SDL_WindowEventID : byte
        {
            SDL_WINDOWEVENT_NONE,
            SDL_WINDOWEVENT_SHOWN,
            SDL_WINDOWEVENT_HIDDEN,
            SDL_WINDOWEVENT_EXPOSED,
            SDL_WINDOWEVENT_MOVED,
            SDL_WINDOWEVENT_RESIZED,
            SDL_WINDOWEVENT_SIZE_CHANGED,
            SDL_WINDOWEVENT_MINIMIZED,
            SDL_WINDOWEVENT_MAXIMIZED,
            SDL_WINDOWEVENT_RESTORED,
            SDL_WINDOWEVENT_ENTER,
            SDL_WINDOWEVENT_LEAVE,
            SDL_WINDOWEVENT_FOCUS_GAINED,
            SDL_WINDOWEVENT_FOCUS_LOST,
            SDL_WINDOWEVENT_CLOSE,
            /* Available in 2.0.5 or higher */
            SDL_WINDOWEVENT_TAKE_FOCUS,
            SDL_WINDOWEVENT_HIT_TEST
        }

        public enum SDL_DisplayEventID : byte
        {
            SDL_DISPLAYEVENT_NONE,
            SDL_DISPLAYEVENT_ORIENTATION
        }

        public enum SDL_DisplayOrientation
        {
            SDL_ORIENTATION_UNKNOWN,
            SDL_ORIENTATION_LANDSCAPE,
            SDL_ORIENTATION_LANDSCAPE_FLIPPED,
            SDL_ORIENTATION_PORTRAIT,
            SDL_ORIENTATION_PORTRAIT_FLIPPED
        }

        [Flags]
        public enum SDL_WindowFlags : uint
        {
            SDL_WINDOW_FULLSCREEN = 0x00000001,
            SDL_WINDOW_OPENGL = 0x00000002,
            SDL_WINDOW_SHOWN = 0x00000004,
            SDL_WINDOW_HIDDEN = 0x00000008,
            SDL_WINDOW_BORDERLESS = 0x00000010,
            SDL_WINDOW_RESIZABLE = 0x00000020,
            SDL_WINDOW_MINIMIZED = 0x00000040,
            SDL_WINDOW_MAXIMIZED = 0x00000080,
            SDL_WINDOW_INPUT_GRABBED = 0x00000100,
            SDL_WINDOW_INPUT_FOCUS = 0x00000200,
            SDL_WINDOW_MOUSE_FOCUS = 0x00000400,
            SDL_WINDOW_FULLSCREEN_DESKTOP =
                (SDL_WINDOW_FULLSCREEN | 0x00001000),
            SDL_WINDOW_FOREIGN = 0x00000800,
            SDL_WINDOW_ALLOW_HIGHDPI = 0x00002000,  /* Only available in 2.0.1 */
            SDL_WINDOW_MOUSE_CAPTURE = 0x00004000,  /* Only available in 2.0.4 */
            SDL_WINDOW_ALWAYS_ON_TOP = 0x00008000,  /* Only available in 2.0.5 */
            SDL_WINDOW_SKIP_TASKBAR = 0x00010000,   /* Only available in 2.0.5 */
            SDL_WINDOW_UTILITY = 0x00020000,    /* Only available in 2.0.5 */
            SDL_WINDOW_TOOLTIP = 0x00040000,    /* Only available in 2.0.5 */
            SDL_WINDOW_POPUP_MENU = 0x00080000, /* Only available in 2.0.5 */
            SDL_WINDOW_VULKAN = 0x10000000, /* Only available in 2.0.6 */
        }

        /* Only available in 2.0.4 */
        public enum SDL_HitTestResult
        {
            SDL_HITTEST_NORMAL,     /* Region is normal. No special properties. */
            SDL_HITTEST_DRAGGABLE,      /* Region can drag entire window. */
            SDL_HITTEST_RESIZE_TOPLEFT,
            SDL_HITTEST_RESIZE_TOP,
            SDL_HITTEST_RESIZE_TOPRIGHT,
            SDL_HITTEST_RESIZE_RIGHT,
            SDL_HITTEST_RESIZE_BOTTOMRIGHT,
            SDL_HITTEST_RESIZE_BOTTOM,
            SDL_HITTEST_RESIZE_BOTTOMLEFT,
            SDL_HITTEST_RESIZE_LEFT
        }

        public const int SDL_WINDOWPOS_UNDEFINED_MASK = 0x1FFF0000;
        public const int SDL_WINDOWPOS_CENTERED_MASK = 0x2FFF0000;
        public const int SDL_WINDOWPOS_UNDEFINED = 0x1FFF0000;
        public const int SDL_WINDOWPOS_CENTERED = 0x2FFF0000;

        public static int SDL_WINDOWPOS_UNDEFINED_DISPLAY(int X)
        {
            return (SDL_WINDOWPOS_UNDEFINED_MASK | X);
        }

        public static bool SDL_WINDOWPOS_ISUNDEFINED(int X)
        {
            return (X & 0xFFFF0000) == SDL_WINDOWPOS_UNDEFINED_MASK;
        }

        public static int SDL_WINDOWPOS_CENTERED_DISPLAY(int X)
        {
            return (SDL_WINDOWPOS_CENTERED_MASK | X);
        }

        public static bool SDL_WINDOWPOS_ISCENTERED(int X)
        {
            return (X & 0xFFFF0000) == SDL_WINDOWPOS_CENTERED_MASK;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_DisplayMode
        {
            public uint format;
            public int w;
            public int h;
            public int refresh_rate;
            public IntPtr driverdata; // void*
        }

        /* win refers to an SDL_Window*, area to a cosnt SDL_Point*, data to a void* */
        /* Only available in 2.0.4 */
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate SDL_HitTestResult SDL_HitTest(IntPtr win, IntPtr area, IntPtr data);

        /* IntPtr refers to an SDL_Window* */
        [DllImport(nativeLibName, EntryPoint = "SDL_CreateWindow", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_CreateWindow(
            byte[] title,
            int x,
            int y,
            int w,
            int h,
            SDL_WindowFlags flags
        );
        public static IntPtr SDL_CreateWindow(
            string title,
            int x,
            int y,
            int w,
            int h,
            SDL_WindowFlags flags
        )
        {
            return INTERNAL_SDL_CreateWindow(
                UTF8_ToNative(title),
                x, y, w, h,
                flags
            );
        }

        /* window refers to an SDL_Window*, renderer to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_CreateWindowAndRenderer(
            int width,
            int height,
            SDL_WindowFlags window_flags,
            out IntPtr window,
            out IntPtr renderer
        );

        /* data refers to some native window type, IntPtr to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateWindowFrom(IntPtr data);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_DestroyWindow(IntPtr window);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_DisableScreenSaver();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_EnableScreenSaver();

        /* IntPtr refers to an SDL_DisplayMode. Just use closest. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetClosestDisplayMode(
            int displayIndex,
            ref SDL_DisplayMode mode,
            out SDL_DisplayMode closest
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetCurrentDisplayMode(
            int displayIndex,
            out SDL_DisplayMode mode
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_GetCurrentVideoDriver", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetCurrentVideoDriver();
        public static string SDL_GetCurrentVideoDriver()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetCurrentVideoDriver());
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetDesktopDisplayMode(
            int displayIndex,
            out SDL_DisplayMode mode
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_GetDisplayName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetDisplayName(int index);
        public static string SDL_GetDisplayName(int index)
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetDisplayName(index));
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetDisplayBounds(
            int displayIndex,
            out SDL_Rect rect
        );

        /* This function is only available in 2.0.4 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetDisplayDPI(
            int displayIndex,
            out float ddpi,
            out float hdpi,
            out float vdpi
        );

        /* This function is only available in 2.0.9 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_DisplayOrientation SDL_GetDisplayOrientation(
            int displayIndex
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetDisplayMode(
            int displayIndex,
            int modeIndex,
            out SDL_DisplayMode mode
        );

        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetDisplayUsableBounds(
            int displayIndex,
            out SDL_Rect rect
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumDisplayModes(
            int displayIndex
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumVideoDisplays();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumVideoDrivers();

        [DllImport(nativeLibName, EntryPoint = "SDL_GetVideoDriver", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetVideoDriver(
            int index
        );
        public static string SDL_GetVideoDriver(int index)
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetVideoDriver(index));
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern float SDL_GetWindowBrightness(
            IntPtr window
        );

        /* window refers to an SDL_Window* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowOpacity(
            IntPtr window,
            float opacity
        );

        /* window refers to an SDL_Window* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetWindowOpacity(
            IntPtr window,
            out float out_opacity
        );

        /* modal_window and parent_window refer to an SDL_Window*s */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowModalFor(
            IntPtr modal_window,
            IntPtr parent_window
        );

        /* window refers to an SDL_Window* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowInputFocus(IntPtr window);

        /* window refers to an SDL_Window*, IntPtr to a void* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetWindowData", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetWindowData(
            IntPtr window,
            byte[] name
        );
        public static IntPtr SDL_GetWindowData(
            IntPtr window,
            string name
        )
        {
            return INTERNAL_SDL_GetWindowData(
                window,
                UTF8_ToNative(name)
            );
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetWindowDisplayIndex(
            IntPtr window
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetWindowDisplayMode(
            IntPtr window,
            out SDL_DisplayMode mode
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_GetWindowFlags(IntPtr window);

        /* IntPtr refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetWindowFromID(uint id);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetWindowGammaRamp(
            IntPtr window,
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] red,
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] green,
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] blue
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_GetWindowGrab(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_GetWindowID(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_GetWindowPixelFormat(
            IntPtr window
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetWindowMaximumSize(
            IntPtr window,
            out int max_w,
            out int max_h
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetWindowMinimumSize(
            IntPtr window,
            out int min_w,
            out int min_h
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetWindowPosition(
            IntPtr window,
            out int x,
            out int y
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetWindowSize(
            IntPtr window,
            out int w,
            out int h
        );

        /* IntPtr refers to an SDL_Surface*, window to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetWindowSurface(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetWindowTitle", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetWindowTitle(
            IntPtr window
        );
        public static string SDL_GetWindowTitle(IntPtr window)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetWindowTitle(window)
            );
        }

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_BindTexture(
            IntPtr texture,
            out float texw,
            out float texh
        );

        /* IntPtr and window refer to an SDL_GLContext and SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GL_CreateContext(IntPtr window);

        /* context refers to an SDL_GLContext */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GL_DeleteContext(IntPtr context);

        /* IntPtr refers to a function pointer */
        [DllImport(nativeLibName, EntryPoint = "SDL_GL_GetProcAddress", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GL_GetProcAddress(
            byte[] proc
        );
        public static IntPtr SDL_GL_GetProcAddress(string proc)
        {
            return INTERNAL_SDL_GL_GetProcAddress(
                UTF8_ToNative(proc)
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_GL_LoadLibrary", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_GL_LoadLibrary(byte[] path);
        public static int SDL_GL_LoadLibrary(string path)
        {
            return INTERNAL_SDL_GL_LoadLibrary(
                UTF8_ToNative(path)
            );
        }

        /* IntPtr refers to a function pointer, proc to a const char* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GL_GetProcAddress(IntPtr proc);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GL_UnloadLibrary();

        [DllImport(nativeLibName, EntryPoint = "SDL_GL_ExtensionSupported", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_bool INTERNAL_SDL_GL_ExtensionSupported(
            byte[] extension
        );
        public static SDL_bool SDL_GL_ExtensionSupported(string extension)
        {
            return INTERNAL_SDL_GL_ExtensionSupported(
                UTF8_ToNative(extension)
            );
        }

        /* Only available in SDL 2.0.2 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GL_ResetAttributes();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_GetAttribute(
            SDL_GLattr attr,
            out int value
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_GetSwapInterval();

        /* window and context refer to an SDL_Window* and SDL_GLContext */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_MakeCurrent(
            IntPtr window,
            IntPtr context
        );

        /* IntPtr refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GL_GetCurrentWindow();

        /* IntPtr refers to an SDL_Context */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GL_GetCurrentContext();

        /* window refers to an SDL_Window*, This function is only available in SDL 2.0.1 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GL_GetDrawableSize(
            IntPtr window,
            out int w,
            out int h
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_SetAttribute(
            SDL_GLattr attr,
            int value
        );

        public static int SDL_GL_SetAttribute(
            SDL_GLattr attr,
            SDL_GLprofile profile
        )
        {
            return SDL_GL_SetAttribute(attr, (int)profile);
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_SetSwapInterval(int interval);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GL_SwapWindow(IntPtr window);

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GL_UnbindTexture(IntPtr texture);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_HideWindow(IntPtr window);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsScreenSaverEnabled();

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MaximizeWindow(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MinimizeWindow(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RaiseWindow(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RestoreWindow(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowBrightness(
            IntPtr window,
            float brightness
        );

        /* IntPtr and userdata are void*, window is an SDL_Window* */
        [DllImport(nativeLibName, EntryPoint = "SDL_SetWindowData", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_SetWindowData(
            IntPtr window,
            byte[] name,
            IntPtr userdata
        );
        public static IntPtr SDL_SetWindowData(
            IntPtr window,
            string name,
            IntPtr userdata
        )
        {
            return INTERNAL_SDL_SetWindowData(
                window,
                UTF8_ToNative(name),
                userdata
            );
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowDisplayMode(
            IntPtr window,
            ref SDL_DisplayMode mode
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowFullscreen(
            IntPtr window,
            uint flags
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowGammaRamp(
            IntPtr window,
            [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] red,
            [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] green,
            [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] blue
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowGrab(
            IntPtr window,
            SDL_bool grabbed
        );

        /* window refers to an SDL_Window*, icon to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowIcon(
            IntPtr window,
            IntPtr icon
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowMaximumSize(
            IntPtr window,
            int max_w,
            int max_h
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowMinimumSize(
            IntPtr window,
            int min_w,
            int min_h
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowPosition(
            IntPtr window,
            int x,
            int y
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowSize(
            IntPtr window,
            int w,
            int h
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowBordered(
            IntPtr window,
            SDL_bool bordered
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetWindowBordersSize(
            IntPtr window,
            out int top,
            out int left,
            out int bottom,
            out int right
        );

        /* window refers to an SDL_Window* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowResizable(
            IntPtr window,
            SDL_bool resizable
        );

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, EntryPoint = "SDL_SetWindowTitle", CallingConvention = CallingConvention.Cdecl)]
        private static extern void INTERNAL_SDL_SetWindowTitle(
            IntPtr window,
            byte[] title
        );
        public static void SDL_SetWindowTitle(
            IntPtr window,
            string title
        )
        {
            INTERNAL_SDL_SetWindowTitle(
                window,
                UTF8_ToNative(title)
            );
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_ShowWindow(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpdateWindowSurface(IntPtr window);

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpdateWindowSurfaceRects(
            IntPtr window,
            [In] SDL_Rect[] rects,
            int numrects
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_VideoInit", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_VideoInit(
            byte[] driver_name
        );
        public static int SDL_VideoInit(string driver_name)
        {
            return INTERNAL_SDL_VideoInit(
                UTF8_ToNative(driver_name)
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_VideoQuit();

        /* window refers to an SDL_Window*, callback_data to a void* */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetWindowHitTest(
            IntPtr window,
            SDL_HitTest callback,
            IntPtr callback_data
        );

        /* IntPtr refers to an SDL_Window* */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetGrabbedWindow();

        #endregion

        #region SDL_blendmode.h

        [Flags]
        public enum SDL_BlendMode
        {
            SDL_BLENDMODE_NONE = 0x00000000,
            SDL_BLENDMODE_BLEND = 0x00000001,
            SDL_BLENDMODE_ADD = 0x00000002,
            SDL_BLENDMODE_MOD = 0x00000004,
            SDL_BLENDMODE_INVALID = 0x7FFFFFFF
        }

        public enum SDL_BlendOperation
        {
            SDL_BLENDOPERATION_ADD = 0x1,
            SDL_BLENDOPERATION_SUBTRACT = 0x2,
            SDL_BLENDOPERATION_REV_SUBTRACT = 0x3,
            SDL_BLENDOPERATION_MINIMUM = 0x4,
            SDL_BLENDOPERATION_MAXIMUM = 0x5
        }

        public enum SDL_BlendFactor
        {
            SDL_BLENDFACTOR_ZERO = 0x1,
            SDL_BLENDFACTOR_ONE = 0x2,
            SDL_BLENDFACTOR_SRC_COLOR = 0x3,
            SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR = 0x4,
            SDL_BLENDFACTOR_SRC_ALPHA = 0x5,
            SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA = 0x6,
            SDL_BLENDFACTOR_DST_COLOR = 0x7,
            SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR = 0x8,
            SDL_BLENDFACTOR_DST_ALPHA = 0x9,
            SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA = 0xA
        }

        /* Only available in 2.0.6 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_BlendMode SDL_ComposeCustomBlendMode(
            SDL_BlendFactor srcColorFactor,
            SDL_BlendFactor dstColorFactor,
            SDL_BlendOperation colorOperation,
            SDL_BlendFactor srcAlphaFactor,
            SDL_BlendFactor dstAlphaFactor,
            SDL_BlendOperation alphaOperation
        );

        #endregion

        #region SDL_vulkan.h

        /* Only available in 2.0.6 */
        [DllImport(nativeLibName, EntryPoint = "SDL_Vulkan_LoadLibrary", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_Vulkan_LoadLibrary(
            byte[] path
        );
        public static int SDL_Vulkan_LoadLibrary(string path)
        {
            return INTERNAL_SDL_Vulkan_LoadLibrary(
                UTF8_ToNative(path)
            );
        }

        /* Only available in 2.0.6 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_Vulkan_GetVkGetInstanceProcAddr();

        /* Only available in 2.0.6 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_Vulkan_UnloadLibrary();

        /* window refers to an SDL_Window*, pNames to a const char**.
		 * Only available in 2.0.6.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_Vulkan_GetInstanceExtensions(
            IntPtr window,
            out uint pCount,
            IntPtr[] pNames
        );

        /* window refers to an SDL_Window.
		 * instance refers to a VkInstance.
		 * surface refers to a VkSurfaceKHR.
		 * Only available in 2.0.6.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_Vulkan_CreateSurface(
            IntPtr window,
            IntPtr instance,
            out ulong surface
        );

        /* window refers to an SDL_Window*.
		 * Only available in 2.0.6.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_Vulkan_GetDrawableSize(
            IntPtr window,
            out int w,
            out int h
        );

        #endregion

        #region SDL_render.h

        [Flags]
        public enum SDL_RendererFlags : uint
        {
            SDL_RENDERER_SOFTWARE = 0x00000001,
            SDL_RENDERER_ACCELERATED = 0x00000002,
            SDL_RENDERER_PRESENTVSYNC = 0x00000004,
            SDL_RENDERER_TARGETTEXTURE = 0x00000008
        }

        [Flags]
        public enum SDL_RendererFlip
        {
            SDL_FLIP_NONE = 0x00000000,
            SDL_FLIP_HORIZONTAL = 0x00000001,
            SDL_FLIP_VERTICAL = 0x00000002
        }

        public enum SDL_TextureAccess
        {
            SDL_TEXTUREACCESS_STATIC,
            SDL_TEXTUREACCESS_STREAMING,
            SDL_TEXTUREACCESS_TARGET
        }

        [Flags]
        public enum SDL_TextureModulate
        {
            SDL_TEXTUREMODULATE_NONE = 0x00000000,
            SDL_TEXTUREMODULATE_HORIZONTAL = 0x00000001,
            SDL_TEXTUREMODULATE_VERTICAL = 0x00000002
        }

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_RendererInfo
        {
            public IntPtr name; // const char*
            public uint flags;
            public uint num_texture_formats;
            public fixed uint texture_formats[16];
            public int max_texture_width;
            public int max_texture_height;
        }

        /* IntPtr refers to an SDL_Renderer*, window to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateRenderer(
            IntPtr window,
            int index,
            SDL_RendererFlags flags
        );

        /* IntPtr refers to an SDL_Renderer*, surface to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateSoftwareRenderer(IntPtr surface);

        /* IntPtr refers to an SDL_Texture*, renderer to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateTexture(
            IntPtr renderer,
            uint format,
            int access,
            int w,
            int h
        );

        /* IntPtr refers to an SDL_Texture*
		 * renderer refers to an SDL_Renderer*
		 * surface refers to an SDL_Surface*
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateTextureFromSurface(
            IntPtr renderer,
            IntPtr surface
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_DestroyRenderer(IntPtr renderer);

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_DestroyTexture(IntPtr texture);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumRenderDrivers();

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRenderDrawBlendMode(
            IntPtr renderer,
            out SDL_BlendMode blendMode
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRenderDrawColor(
            IntPtr renderer,
            out byte r,
            out byte g,
            out byte b,
            out byte a
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRenderDriverInfo(
            int index,
            out SDL_RendererInfo info
        );

        /* IntPtr refers to an SDL_Renderer*, window to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetRenderer(IntPtr window);

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRendererInfo(
            IntPtr renderer,
            out SDL_RendererInfo info
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetRendererOutputSize(
            IntPtr renderer,
            out int w,
            out int h
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetTextureAlphaMod(
            IntPtr texture,
            out byte alpha
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetTextureBlendMode(
            IntPtr texture,
            out SDL_BlendMode blendMode
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetTextureColorMod(
            IntPtr texture,
            out byte r,
            out byte g,
            out byte b
        );

        /* texture refers to an SDL_Texture*, pixels to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_LockTexture(
            IntPtr texture,
            ref SDL_Rect rect,
            out IntPtr pixels,
            out int pitch
        );

        /* texture refers to an SDL_Texture*, pixels to a void*.
		 * Internally, this function contains logic to use default values when
		 * the rectangle is passed as NULL.
		 * This overload allows for IntPtr.Zero to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_LockTexture(
            IntPtr texture,
            IntPtr rect,
            out IntPtr pixels,
            out int pitch
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_QueryTexture(
            IntPtr texture,
            out uint format,
            out int access,
            out int w,
            out int h
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderClear(IntPtr renderer);

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopy(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_Rect dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopy(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_Rect dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopy(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both SDL_Rects.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopy(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_Rect dstrect,
            double angle,
            ref SDL_Point center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_Rect dstrect,
            double angle,
            ref SDL_Point center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect,
            double angle,
            ref SDL_Point center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_Rect dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * srcrect and dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect,
            double angle,
            ref SDL_Point center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * srcrect and center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_Rect dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * dstrect and center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for all
		 * three parameters.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawLine(
            IntPtr renderer,
            int x1,
            int y1,
            int x2,
            int y2
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawLines(
            IntPtr renderer,
            [In] SDL_Point[] points,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawPoint(
            IntPtr renderer,
            int x,
            int y
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawPoints(
            IntPtr renderer,
            [In] SDL_Point[] points,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRect(
            IntPtr renderer,
            ref SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer*, rect to an SDL_Rect*.
		 * This overload allows for IntPtr.Zero (null) to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRect(
            IntPtr renderer,
            IntPtr rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRects(
            IntPtr renderer,
            [In] SDL_Rect[] rects,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRect(
            IntPtr renderer,
            ref SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer*, rect to an SDL_Rect*.
		 * This overload allows for IntPtr.Zero (null) to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRect(
            IntPtr renderer,
            IntPtr rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRects(
            IntPtr renderer,
            [In] SDL_Rect[] rects,
            int count
        );

        #region Floating Point Render Functions

        /* This region only available in SDL 2.0.10 or higher. */

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyF(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_FRect dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyF(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_FRect dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyF(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both SDL_Rects.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyF(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_FRect dstrect,
            double angle,
            ref SDL_FPoint center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyEx(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_FRect dstrect,
            double angle,
            ref SDL_FPoint center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect,
            double angle,
            ref SDL_FPoint center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            ref SDL_FRect dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * srcrect and dstrect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect,
            double angle,
            ref SDL_FPoint center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * srcrect and center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            ref SDL_FRect dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both
		 * dstrect and center.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            ref SDL_Rect srcrect,
            IntPtr dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture*.
		 * Internally, this function contains logic to use default values when
		 * source, destination, and/or center are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for all
		 * three parameters.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderCopyExF(
            IntPtr renderer,
            IntPtr texture,
            IntPtr srcrect,
            IntPtr dstrect,
            double angle,
            IntPtr center,
            SDL_RendererFlip flip
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawPointF(
            IntPtr renderer,
            float x,
            float y
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawPointsF(
            IntPtr renderer,
            [In] SDL_FPoint[] points,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawLineF(
            IntPtr renderer,
            float x1,
            float y1,
            float x2,
            float y2
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawLinesF(
            IntPtr renderer,
            [In] SDL_FPoint[] points,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRectF(
            IntPtr renderer,
            ref SDL_FRect rect
        );

        /* renderer refers to an SDL_Renderer*, rect to an SDL_Rect*.
		 * This overload allows for IntPtr.Zero (null) to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRectF(
            IntPtr renderer,
            IntPtr rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderDrawRectsF(
            IntPtr renderer,
            [In] SDL_FRect[] rects,
            int count
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRectF(
            IntPtr renderer,
            ref SDL_FRect rect
        );

        /* renderer refers to an SDL_Renderer*, rect to an SDL_Rect*.
		 * This overload allows for IntPtr.Zero (null) to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRectF(
            IntPtr renderer,
            IntPtr rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFillRectsF(
            IntPtr renderer,
            [In] SDL_FRect[] rects,
            int count
        );

        #endregion

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RenderGetClipRect(
            IntPtr renderer,
            out SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RenderGetLogicalSize(
            IntPtr renderer,
            out int w,
            out int h
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RenderGetScale(
            IntPtr renderer,
            out float scaleX,
            out float scaleY
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderGetViewport(
            IntPtr renderer,
            out SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_RenderPresent(IntPtr renderer);

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderReadPixels(
            IntPtr renderer,
            ref SDL_Rect rect,
            uint format,
            IntPtr pixels,
            int pitch
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetClipRect(
            IntPtr renderer,
            ref SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer*
		 * This overload allows for IntPtr.Zero (null) to be passed for rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetClipRect(
            IntPtr renderer,
            IntPtr rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetLogicalSize(
            IntPtr renderer,
            int w,
            int h
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetScale(
            IntPtr renderer,
            float scaleX,
            float scaleY
        );

        /* renderer refers to an SDL_Renderer* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetIntegerScale(
            IntPtr renderer,
            SDL_bool enable
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderSetViewport(
            IntPtr renderer,
            ref SDL_Rect rect
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetRenderDrawBlendMode(
            IntPtr renderer,
            SDL_BlendMode blendMode
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetRenderDrawColor(
            IntPtr renderer,
            byte r,
            byte g,
            byte b,
            byte a
        );

        /* renderer refers to an SDL_Renderer*, texture to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetRenderTarget(
            IntPtr renderer,
            IntPtr texture
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetTextureAlphaMod(
            IntPtr texture,
            byte alpha
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetTextureBlendMode(
            IntPtr texture,
            SDL_BlendMode blendMode
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetTextureColorMod(
            IntPtr texture,
            byte r,
            byte g,
            byte b
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnlockTexture(IntPtr texture);

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpdateTexture(
            IntPtr texture,
            ref SDL_Rect rect,
            IntPtr pixels,
            int pitch
        );

        /* texture refers to an SDL_Texture* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpdateTexture(
            IntPtr texture,
            IntPtr rect,
            IntPtr pixels,
            int pitch
        );

        /* texture refers to an SDL_Texture* */
        /* Available in 2.0.1 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpdateYUVTexture(
            IntPtr texture,
            ref SDL_Rect rect,
            IntPtr yPlane,
            int yPitch,
            IntPtr uPlane,
            int uPitch,
            IntPtr vPlane,
            int vPitch
        );

        /* renderer refers to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_RenderTargetSupported(
            IntPtr renderer
        );

        /* IntPtr refers to an SDL_Texture*, renderer to an SDL_Renderer* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetRenderTarget(IntPtr renderer);

        /* renderer refers to an SDL_Renderer* */
        /* Available in 2.0.8 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_RenderGetMetalLayer(
            IntPtr renderer
        );

        /* renderer refers to an SDL_Renderer* */
        /* Available in 2.0.8 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_RenderGetMetalCommandEncoder(
            IntPtr renderer
        );

        /* renderer refers to an SDL_Renderer* */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_RenderIsClipEnabled(IntPtr renderer);

        /* renderer refers to an SDL_Renderer* */
        /* Available in 2.0.10 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_RenderFlush(IntPtr renderer);

        #endregion

        #region SDL_pixels.h

        public static uint SDL_DEFINE_PIXELFOURCC(byte A, byte B, byte C, byte D)
        {
            return SDL_FOURCC(A, B, C, D);
        }

        public static uint SDL_DEFINE_PIXELFORMAT(
            SDL_PIXELTYPE_ENUM type,
            SDL_PIXELORDER_ENUM order,
            SDL_PACKEDLAYOUT_ENUM layout,
            byte bits,
            byte bytes
        )
        {
            return (uint)(
                (1 << 28) |
                (((byte)type) << 24) |
                (((byte)order) << 20) |
                (((byte)layout) << 16) |
                (bits << 8) |
                (bytes)
            );
        }

        public static byte SDL_PIXELFLAG(uint X)
        {
            return (byte)((X >> 28) & 0x0F);
        }

        public static byte SDL_PIXELTYPE(uint X)
        {
            return (byte)((X >> 24) & 0x0F);
        }

        public static byte SDL_PIXELORDER(uint X)
        {
            return (byte)((X >> 20) & 0x0F);
        }

        public static byte SDL_PIXELLAYOUT(uint X)
        {
            return (byte)((X >> 16) & 0x0F);
        }

        public static byte SDL_BITSPERPIXEL(uint X)
        {
            return (byte)((X >> 8) & 0xFF);
        }

        public static byte SDL_BYTESPERPIXEL(uint X)
        {
            if (SDL_ISPIXELFORMAT_FOURCC(X))
            {
                if ((X == SDL_PIXELFORMAT_YUY2) ||
                        (X == SDL_PIXELFORMAT_UYVY) ||
                        (X == SDL_PIXELFORMAT_YVYU))
                {
                    return 2;
                }
                return 1;
            }
            return (byte)(X & 0xFF);
        }

        public static bool SDL_ISPIXELFORMAT_INDEXED(uint format)
        {
            if (SDL_ISPIXELFORMAT_FOURCC(format))
            {
                return false;
            }
            SDL_PIXELTYPE_ENUM pType =
                    (SDL_PIXELTYPE_ENUM)SDL_PIXELTYPE(format);
            return (
                pType == SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX1 ||
                pType == SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX4 ||
                pType == SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX8
            );
        }

        public static bool SDL_ISPIXELFORMAT_ALPHA(uint format)
        {
            if (SDL_ISPIXELFORMAT_FOURCC(format))
            {
                return false;
            }
            SDL_PIXELORDER_ENUM pOrder =
                    (SDL_PIXELORDER_ENUM)SDL_PIXELORDER(format);
            return (
                pOrder == SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ARGB ||
                pOrder == SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_RGBA ||
                pOrder == SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ABGR ||
                pOrder == SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_BGRA
            );
        }

        public static bool SDL_ISPIXELFORMAT_FOURCC(uint format)
        {
            return (format == 0) && (SDL_PIXELFLAG(format) != 1);
        }

        public enum SDL_PIXELTYPE_ENUM
        {
            SDL_PIXELTYPE_UNKNOWN,
            SDL_PIXELTYPE_INDEX1,
            SDL_PIXELTYPE_INDEX4,
            SDL_PIXELTYPE_INDEX8,
            SDL_PIXELTYPE_PACKED8,
            SDL_PIXELTYPE_PACKED16,
            SDL_PIXELTYPE_PACKED32,
            SDL_PIXELTYPE_ARRAYU8,
            SDL_PIXELTYPE_ARRAYU16,
            SDL_PIXELTYPE_ARRAYU32,
            SDL_PIXELTYPE_ARRAYF16,
            SDL_PIXELTYPE_ARRAYF32
        }

        public enum SDL_PIXELORDER_ENUM
        {
            /* BITMAPORDER */
            SDL_BITMAPORDER_NONE,
            SDL_BITMAPORDER_4321,
            SDL_BITMAPORDER_1234,
            /* PACKEDORDER */
            SDL_PACKEDORDER_NONE = 0,
            SDL_PACKEDORDER_XRGB,
            SDL_PACKEDORDER_RGBX,
            SDL_PACKEDORDER_ARGB,
            SDL_PACKEDORDER_RGBA,
            SDL_PACKEDORDER_XBGR,
            SDL_PACKEDORDER_BGRX,
            SDL_PACKEDORDER_ABGR,
            SDL_PACKEDORDER_BGRA,
            /* ARRAYORDER */
            SDL_ARRAYORDER_NONE = 0,
            SDL_ARRAYORDER_RGB,
            SDL_ARRAYORDER_RGBA,
            SDL_ARRAYORDER_ARGB,
            SDL_ARRAYORDER_BGR,
            SDL_ARRAYORDER_BGRA,
            SDL_ARRAYORDER_ABGR
        }

        public enum SDL_PACKEDLAYOUT_ENUM
        {
            SDL_PACKEDLAYOUT_NONE,
            SDL_PACKEDLAYOUT_332,
            SDL_PACKEDLAYOUT_4444,
            SDL_PACKEDLAYOUT_1555,
            SDL_PACKEDLAYOUT_5551,
            SDL_PACKEDLAYOUT_565,
            SDL_PACKEDLAYOUT_8888,
            SDL_PACKEDLAYOUT_2101010,
            SDL_PACKEDLAYOUT_1010102
        }

        public static readonly uint SDL_PIXELFORMAT_UNKNOWN = 0;
        public static readonly uint SDL_PIXELFORMAT_INDEX1LSB =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX1,
                SDL_PIXELORDER_ENUM.SDL_BITMAPORDER_4321,
                0,
                1, 0
            );
        public static readonly uint SDL_PIXELFORMAT_INDEX1MSB =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX1,
                SDL_PIXELORDER_ENUM.SDL_BITMAPORDER_1234,
                0,
                1, 0
            );
        public static readonly uint SDL_PIXELFORMAT_INDEX4LSB =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX4,
                SDL_PIXELORDER_ENUM.SDL_BITMAPORDER_4321,
                0,
                4, 0
            );
        public static readonly uint SDL_PIXELFORMAT_INDEX4MSB =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX4,
                SDL_PIXELORDER_ENUM.SDL_BITMAPORDER_1234,
                0,
                4, 0
            );
        public static readonly uint SDL_PIXELFORMAT_INDEX8 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX8,
                0,
                0,
                8, 1
            );
        public static readonly uint SDL_PIXELFORMAT_RGB332 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED8,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XRGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_332,
                8, 1
            );
        public static readonly uint SDL_PIXELFORMAT_RGB444 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XRGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_4444,
                12, 2
            );
        public static readonly uint SDL_PIXELFORMAT_RGB555 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XRGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_1555,
                15, 2
            );
        public static readonly uint SDL_PIXELFORMAT_BGR555 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_INDEX1,
                SDL_PIXELORDER_ENUM.SDL_BITMAPORDER_4321,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_1555,
                15, 2
            );
        public static readonly uint SDL_PIXELFORMAT_ARGB4444 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ARGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_4444,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_RGBA4444 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_RGBA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_4444,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_ABGR4444 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ABGR,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_4444,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_BGRA4444 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_BGRA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_4444,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_ARGB1555 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ARGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_1555,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_RGBA5551 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_RGBA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_5551,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_ABGR1555 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ABGR,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_1555,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_BGRA5551 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_BGRA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_5551,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_RGB565 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XRGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_565,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_BGR565 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED16,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XBGR,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_565,
                16, 2
            );
        public static readonly uint SDL_PIXELFORMAT_RGB24 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_ARRAYU8,
                SDL_PIXELORDER_ENUM.SDL_ARRAYORDER_RGB,
                0,
                24, 3
            );
        public static readonly uint SDL_PIXELFORMAT_BGR24 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_ARRAYU8,
                SDL_PIXELORDER_ENUM.SDL_ARRAYORDER_BGR,
                0,
                24, 3
            );
        public static readonly uint SDL_PIXELFORMAT_RGB888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XRGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                24, 4
            );
        public static readonly uint SDL_PIXELFORMAT_RGBX8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_RGBX,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                24, 4
            );
        public static readonly uint SDL_PIXELFORMAT_BGR888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_XBGR,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                24, 4
            );
        public static readonly uint SDL_PIXELFORMAT_BGRX8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_BGRX,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                24, 4
            );
        public static readonly uint SDL_PIXELFORMAT_ARGB8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ARGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                32, 4
            );
        public static readonly uint SDL_PIXELFORMAT_RGBA8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_RGBA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                32, 4
            );
        public static readonly uint SDL_PIXELFORMAT_ABGR8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ABGR,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                32, 4
            );
        public static readonly uint SDL_PIXELFORMAT_BGRA8888 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_BGRA,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_8888,
                32, 4
            );
        public static readonly uint SDL_PIXELFORMAT_ARGB2101010 =
            SDL_DEFINE_PIXELFORMAT(
                SDL_PIXELTYPE_ENUM.SDL_PIXELTYPE_PACKED32,
                SDL_PIXELORDER_ENUM.SDL_PACKEDORDER_ARGB,
                SDL_PACKEDLAYOUT_ENUM.SDL_PACKEDLAYOUT_2101010,
                32, 4
            );
        public static readonly uint SDL_PIXELFORMAT_YV12 =
            SDL_DEFINE_PIXELFOURCC(
                (byte)'Y', (byte)'V', (byte)'1', (byte)'2'
            );
        public static readonly uint SDL_PIXELFORMAT_IYUV =
            SDL_DEFINE_PIXELFOURCC(
                (byte)'I', (byte)'Y', (byte)'U', (byte)'V'
            );
        public static readonly uint SDL_PIXELFORMAT_YUY2 =
            SDL_DEFINE_PIXELFOURCC(
                (byte)'Y', (byte)'U', (byte)'Y', (byte)'2'
            );
        public static readonly uint SDL_PIXELFORMAT_UYVY =
            SDL_DEFINE_PIXELFOURCC(
                (byte)'U', (byte)'Y', (byte)'V', (byte)'Y'
            );
        public static readonly uint SDL_PIXELFORMAT_YVYU =
            SDL_DEFINE_PIXELFOURCC(
                (byte)'Y', (byte)'V', (byte)'Y', (byte)'U'
            );

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Color
        {
            public byte r;
            public byte g;
            public byte b;
            public byte a;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Palette
        {
            public int ncolors;
            public IntPtr colors;
            public int version;
            public int refcount;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_PixelFormat
        {
            public uint format;
            public IntPtr palette; // SDL_Palette*
            public byte BitsPerPixel;
            public byte BytesPerPixel;
            public uint Rmask;
            public uint Gmask;
            public uint Bmask;
            public uint Amask;
            public byte Rloss;
            public byte Gloss;
            public byte Bloss;
            public byte Aloss;
            public byte Rshift;
            public byte Gshift;
            public byte Bshift;
            public byte Ashift;
            public int refcount;
            public IntPtr next; // SDL_PixelFormat*
        }

        /* IntPtr refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_AllocFormat(uint pixel_format);

        /* IntPtr refers to an SDL_Palette* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_AllocPalette(int ncolors);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_CalculateGammaRamp(
            float gamma,
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U2, SizeConst = 256)]
                ushort[] ramp
        );

        /* format refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeFormat(IntPtr format);

        /* palette refers to an SDL_Palette* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreePalette(IntPtr palette);

        [DllImport(nativeLibName, EntryPoint = "SDL_GetPixelFormatName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetPixelFormatName(
            uint format
        );
        public static string SDL_GetPixelFormatName(uint format)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetPixelFormatName(format)
            );
        }

        /* format refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetRGB(
            uint pixel,
            IntPtr format,
            out byte r,
            out byte g,
            out byte b
        );

        /* format refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetRGBA(
            uint pixel,
            IntPtr format,
            out byte r,
            out byte g,
            out byte b,
            out byte a
        );

        /* format refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_MapRGB(
            IntPtr format,
            byte r,
            byte g,
            byte b
        );

        /* format refers to an SDL_PixelFormat* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_MapRGBA(
            IntPtr format,
            byte r,
            byte g,
            byte b,
            byte a
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_MasksToPixelFormatEnum(
            int bpp,
            uint Rmask,
            uint Gmask,
            uint Bmask,
            uint Amask
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_PixelFormatEnumToMasks(
            uint format,
            out int bpp,
            out uint Rmask,
            out uint Gmask,
            out uint Bmask,
            out uint Amask
        );

        /* palette refers to an SDL_Palette* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetPaletteColors(
            IntPtr palette,
            [In] SDL_Color[] colors,
            int firstcolor,
            int ncolors
        );

        /* format and palette refer to an SDL_PixelFormat* and SDL_Palette* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetPixelFormatPalette(
            IntPtr format,
            IntPtr palette
        );

        #endregion

        #region SDL_rect.h

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Point
        {
            public int x;
            public int y;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Rect
        {
            public int x;
            public int y;
            public int w;
            public int h;
        }

        /* Only available in 2.0.10 or higher. */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_FPoint
        {
            public float x;
            public float y;
        }

        /* Only available in 2.0.10 or higher. */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_FRect
        {
            public float x;
            public float y;
            public float w;
            public float h;
        }

        /* Only available in 2.0.4 */
        public static SDL_bool SDL_PointInRect(ref SDL_Point p, ref SDL_Rect r)
        {
            return ((p.x >= r.x) &&
                    (p.x < (r.x + r.w)) &&
                    (p.y >= r.y) &&
                    (p.y < (r.y + r.h))) ?
                SDL_bool.SDL_TRUE :
                SDL_bool.SDL_FALSE;
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_EnclosePoints(
            [In] SDL_Point[] points,
            int count,
            ref SDL_Rect clip,
            out SDL_Rect result
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasIntersection(
            ref SDL_Rect A,
            ref SDL_Rect B
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IntersectRect(
            ref SDL_Rect A,
            ref SDL_Rect B,
            out SDL_Rect result
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IntersectRectAndLine(
            ref SDL_Rect rect,
            ref int X1,
            ref int Y1,
            ref int X2,
            ref int Y2
        );

        public static SDL_bool SDL_RectEmpty(ref SDL_Rect r)
        {
            return ((r.w <= 0) || (r.h <= 0)) ?
                SDL_bool.SDL_TRUE :
                SDL_bool.SDL_FALSE;
        }

        public static SDL_bool SDL_RectEquals(
            ref SDL_Rect a,
            ref SDL_Rect b
        )
        {
            return ((a.x == b.x) &&
                    (a.y == b.y) &&
                    (a.w == b.w) &&
                    (a.h == b.h)) ?
                SDL_bool.SDL_TRUE :
                SDL_bool.SDL_FALSE;
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnionRect(
            ref SDL_Rect A,
            ref SDL_Rect B,
            out SDL_Rect result
        );

        #endregion

        #region SDL_surface.h

        public const uint SDL_SWSURFACE = 0x00000000;
        public const uint SDL_PREALLOC = 0x00000001;
        public const uint SDL_RLEACCEL = 0x00000002;
        public const uint SDL_DONTFREE = 0x00000004;

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Surface
        {
            public uint flags;
            public IntPtr format; // SDL_PixelFormat*
            public int w;
            public int h;
            public int pitch;
            public IntPtr pixels; // void*
            public IntPtr userdata; // void*
            public int locked;
            public IntPtr lock_data; // void*
            public SDL_Rect clip_rect;
            public IntPtr map; // SDL_BlitMap*
            public int refcount;
        }

        /* surface refers to an SDL_Surface* */
        public static bool SDL_MUSTLOCK(IntPtr surface)
        {
            SDL_Surface sur;
            sur = (SDL_Surface)Marshal.PtrToStructure(
                surface,
                typeof(SDL_Surface)
            );
            return (sur.flags & SDL_RLEACCEL) != 0;
        }

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlit", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitSurface(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlit", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitSurface(
            IntPtr src,
            IntPtr srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlit", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitSurface(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            IntPtr dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both SDL_Rects.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlit", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitSurface(
            IntPtr src,
            IntPtr srcrect,
            IntPtr dst,
            IntPtr dstrect
        );

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlitScaled", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitScaled(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for srcrect.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlitScaled", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitScaled(
            IntPtr src,
            IntPtr srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for dstrect.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlitScaled", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitScaled(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            IntPtr dstrect
        );

        /* src and dst refer to an SDL_Surface*
		 * Internally, this function contains logic to use default values when
		 * source and destination rectangles are passed as NULL.
		 * This overload allows for IntPtr.Zero (null) to be passed for both SDL_Rects.
		 */
        [DllImport(nativeLibName, EntryPoint = "SDL_UpperBlitScaled", CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_BlitScaled(
            IntPtr src,
            IntPtr srcrect,
            IntPtr dst,
            IntPtr dstrect
        );

        /* src and dst are void* pointers */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_ConvertPixels(
            int width,
            int height,
            uint src_format,
            IntPtr src,
            int src_pitch,
            uint dst_format,
            IntPtr dst,
            int dst_pitch
        );

        /* IntPtr refers to an SDL_Surface*
		 * src refers to an SDL_Surface*
		 * fmt refers to an SDL_PixelFormat*
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_ConvertSurface(
            IntPtr src,
            IntPtr fmt,
            uint flags
        );

        /* IntPtr refers to an SDL_Surface*, src to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_ConvertSurfaceFormat(
            IntPtr src,
            uint pixel_format,
            uint flags
        );

        /* IntPtr refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateRGBSurface(
            uint flags,
            int width,
            int height,
            int depth,
            uint Rmask,
            uint Gmask,
            uint Bmask,
            uint Amask
        );

        /* IntPtr refers to an SDL_Surface*, pixels to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateRGBSurfaceFrom(
            IntPtr pixels,
            int width,
            int height,
            int depth,
            int pitch,
            uint Rmask,
            uint Gmask,
            uint Bmask,
            uint Amask
        );

        /* IntPtr refers to an SDL_Surface* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateRGBSurfaceWithFormat(
            uint flags,
            int width,
            int height,
            int depth,
            uint format
        );

        /* IntPtr refers to an SDL_Surface*, pixels to a void* */
        /* Available in 2.0.5 or higher */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateRGBSurfaceWithFormatFrom(
            IntPtr pixels,
            int width,
            int height,
            int depth,
            int pitch,
            uint format
        );

        /* dst refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_FillRect(
            IntPtr dst,
            ref SDL_Rect rect,
            uint color
        );

        /* dst refers to an SDL_Surface*.
		 * This overload allows passing NULL to rect.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_FillRect(
            IntPtr dst,
            IntPtr rect,
            uint color
        );

        /* dst refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_FillRects(
            IntPtr dst,
            [In] SDL_Rect[] rects,
            int count,
            uint color
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeSurface(IntPtr surface);

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GetClipRect(
            IntPtr surface,
            out SDL_Rect rect
        );

        /* surface refers to an SDL_Surface*.
		 * This function is only available in 2.0.9 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasColorKey(IntPtr surface);

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetColorKey(
            IntPtr surface,
            out uint key
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetSurfaceAlphaMod(
            IntPtr surface,
            out byte alpha
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetSurfaceBlendMode(
            IntPtr surface,
            out SDL_BlendMode blendMode
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetSurfaceColorMod(
            IntPtr surface,
            out byte r,
            out byte g,
            out byte b
        );

        /* These are for SDL_LoadBMP, which is a macro in the SDL headers. */
        /* IntPtr refers to an SDL_Surface* */
        /* THIS IS AN RWops FUNCTION! */
        [DllImport(nativeLibName, EntryPoint = "SDL_LoadBMP_RW", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_LoadBMP_RW(
            IntPtr src,
            int freesrc
        );
        public static IntPtr SDL_LoadBMP(string file)
        {
            IntPtr rwops = SDL_RWFromFile(file, "rb");
            return INTERNAL_SDL_LoadBMP_RW(rwops, 1);
        }

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_LockSurface(IntPtr surface);

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_LowerBlit(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_LowerBlitScaled(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* These are for SDL_SaveBMP, which is a macro in the SDL headers. */
        /* IntPtr refers to an SDL_Surface* */
        /* THIS IS AN RWops FUNCTION! */
        [DllImport(nativeLibName, EntryPoint = "SDL_SaveBMP_RW", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_SaveBMP_RW(
            IntPtr surface,
            IntPtr src,
            int freesrc
        );
        public static int SDL_SaveBMP(IntPtr surface, string file)
        {
            IntPtr rwops = SDL_RWFromFile(file, "wb");
            return INTERNAL_SDL_SaveBMP_RW(surface, rwops, 1);
        }

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_SetClipRect(
            IntPtr surface,
            ref SDL_Rect rect
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetColorKey(
            IntPtr surface,
            int flag,
            uint key
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetSurfaceAlphaMod(
            IntPtr surface,
            byte alpha
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetSurfaceBlendMode(
            IntPtr surface,
            SDL_BlendMode blendMode
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetSurfaceColorMod(
            IntPtr surface,
            byte r,
            byte g,
            byte b
        );

        /* surface refers to an SDL_Surface*, palette to an SDL_Palette* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetSurfacePalette(
            IntPtr surface,
            IntPtr palette
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetSurfaceRLE(
            IntPtr surface,
            int flag
        );

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SoftStretch(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* surface refers to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnlockSurface(IntPtr surface);

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpperBlit(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* src and dst refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_UpperBlitScaled(
            IntPtr src,
            ref SDL_Rect srcrect,
            IntPtr dst,
            ref SDL_Rect dstrect
        );

        /* surface and IntPtr refer to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_DuplicateSurface(IntPtr surface);

        #endregion

        #region SDL_clipboard.h

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasClipboardText();

        [DllImport(nativeLibName, EntryPoint = "SDL_GetClipboardText", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetClipboardText();
        public static string SDL_GetClipboardText()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetClipboardText(), true);
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_SetClipboardText", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_SetClipboardText(
            byte[] text
        );
        public static int SDL_SetClipboardText(
            string text
        )
        {
            return INTERNAL_SDL_SetClipboardText(
                UTF8_ToNative(text)
            );
        }

        #endregion

        #region SDL_events.h

        /* General keyboard/mouse state definitions. */
        public const byte SDL_PRESSED = 1;
        public const byte SDL_RELEASED = 0;

        /* Default size is according to SDL2 default. */
        public const int SDL_TEXTEDITINGEVENT_TEXT_SIZE = 32;
        public const int SDL_TEXTINPUTEVENT_TEXT_SIZE = 32;

        /* The types of events that can be delivered. */
        public enum SDL_EventType : uint
        {
            SDL_FIRSTEVENT = 0,

            /* Application events */
            SDL_QUIT = 0x100,

            /* iOS/Android/WinRT app events */
            SDL_APP_TERMINATING,
            SDL_APP_LOWMEMORY,
            SDL_APP_WILLENTERBACKGROUND,
            SDL_APP_DIDENTERBACKGROUND,
            SDL_APP_WILLENTERFOREGROUND,
            SDL_APP_DIDENTERFOREGROUND,

            /* Display events */
            /* Only available in SDL 2.0.9 or higher */
            SDL_DISPLAYEVENT = 0x150,

            /* Window events */
            SDL_WINDOWEVENT = 0x200,
            SDL_SYSWMEVENT,

            /* Keyboard events */
            SDL_KEYDOWN = 0x300,
            SDL_KEYUP,
            SDL_TEXTEDITING,
            SDL_TEXTINPUT,
            SDL_KEYMAPCHANGED,

            /* Mouse events */
            SDL_MOUSEMOTION = 0x400,
            SDL_MOUSEBUTTONDOWN,
            SDL_MOUSEBUTTONUP,
            SDL_MOUSEWHEEL,

            /* Joystick events */
            SDL_JOYAXISMOTION = 0x600,
            SDL_JOYBALLMOTION,
            SDL_JOYHATMOTION,
            SDL_JOYBUTTONDOWN,
            SDL_JOYBUTTONUP,
            SDL_JOYDEVICEADDED,
            SDL_JOYDEVICEREMOVED,

            /* Game controller events */
            SDL_CONTROLLERAXISMOTION = 0x650,
            SDL_CONTROLLERBUTTONDOWN,
            SDL_CONTROLLERBUTTONUP,
            SDL_CONTROLLERDEVICEADDED,
            SDL_CONTROLLERDEVICEREMOVED,
            SDL_CONTROLLERDEVICEREMAPPED,

            /* Touch events */
            SDL_FINGERDOWN = 0x700,
            SDL_FINGERUP,
            SDL_FINGERMOTION,

            /* Gesture events */
            SDL_DOLLARGESTURE = 0x800,
            SDL_DOLLARRECORD,
            SDL_MULTIGESTURE,

            /* Clipboard events */
            SDL_CLIPBOARDUPDATE = 0x900,

            /* Drag and drop events */
            SDL_DROPFILE = 0x1000,
            /* Only available in 2.0.4 or higher */
            SDL_DROPTEXT,
            SDL_DROPBEGIN,
            SDL_DROPCOMPLETE,

            /* Audio hotplug events */
            /* Only available in SDL 2.0.4 or higher */
            SDL_AUDIODEVICEADDED = 0x1100,
            SDL_AUDIODEVICEREMOVED,

            /* Sensor events */
            /* Only available in SDL 2.0.9 or higher */
            SDL_SENSORUPDATE = 0x1200,

            /* Render events */
            /* Only available in SDL 2.0.2 or higher */
            SDL_RENDER_TARGETS_RESET = 0x2000,
            /* Only available in SDL 2.0.4 or higher */
            SDL_RENDER_DEVICE_RESET,

            /* Events SDL_USEREVENT through SDL_LASTEVENT are for
			 * your use, and should be allocated with
			 * SDL_RegisterEvents()
			 */
            SDL_USEREVENT = 0x8000,

            /* The last event, used for bouding arrays. */
            SDL_LASTEVENT = 0xFFFF
        }

        /* Only available in 2.0.4 or higher */
        public enum SDL_MouseWheelDirection : uint
        {
            SDL_MOUSEWHEEL_NORMAL,
            SDL_MOUSEWHEEL_FLIPPED
        }

        /* Fields shared by every event */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_GenericEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
        }

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_DisplayEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 display;
            public SDL_DisplayEventID displayEvent; // event, lolC#
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int32 data1;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Window state change event data (event.window.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_WindowEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public SDL_WindowEventID windowEvent; // event, lolC#
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int32 data1;
            public Int32 data2;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Keyboard button event structure (event.key.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_KeyboardEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public byte state;
            public byte repeat; /* non-zero if this is a repeat */
            private byte padding2;
            private byte padding3;
            public SDL_Keysym keysym;
        }
#pragma warning restore 0169

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_TextEditingEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public fixed byte text[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
            public Int32 start;
            public Int32 length;
        }

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_TextInputEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public fixed byte text[SDL_TEXTINPUTEVENT_TEXT_SIZE];
        }

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Mouse motion event structure (event.motion.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MouseMotionEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public UInt32 which;
            public byte state; /* bitmask of buttons */
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int32 x;
            public Int32 y;
            public Int32 xrel;
            public Int32 yrel;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Mouse button event structure (event.button.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MouseButtonEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public UInt32 which;
            public byte button; /* button id */
            public byte state; /* SDL_PRESSED or SDL_RELEASED */
            public byte clicks; /* 1 for single-click, 2 for double-click, etc. */
            private byte padding1;
            public Int32 x;
            public Int32 y;
        }
#pragma warning restore 0169

        /* Mouse wheel event structure (event.wheel.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MouseWheelEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public UInt32 which;
            public Int32 x; /* amount scrolled horizontally */
            public Int32 y; /* amount scrolled vertically */
            public UInt32 direction; /* Set to one of the SDL_MOUSEWHEEL_* defines */
        }

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Joystick axis motion event structure (event.jaxis.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_JoyAxisEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte axis;
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int16 axisValue; /* value, lolC# */
            public UInt16 padding4;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Joystick trackball motion event structure (event.jball.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_JoyBallEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte ball;
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int16 xrel;
            public Int16 yrel;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Joystick hat position change event struct (event.jhat.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_JoyHatEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte hat; /* index of the hat */
            public byte hatValue; /* value, lolC# */
            private byte padding1;
            private byte padding2;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Joystick button event structure (event.jbutton.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_JoyButtonEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte button;
            public byte state; /* SDL_PRESSED or SDL_RELEASED */
            private byte padding1;
            private byte padding2;
        }
#pragma warning restore 0169

        /* Joystick device event structure (event.jdevice.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_JoyDeviceEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
        }

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Game controller axis motion event (event.caxis.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_ControllerAxisEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte axis;
            private byte padding1;
            private byte padding2;
            private byte padding3;
            public Int16 axisValue; /* value, lolC# */
            private UInt16 padding4;
        }
#pragma warning restore 0169

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Game controller button event (event.cbutton.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_ControllerButtonEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* SDL_JoystickID */
            public byte button;
            public byte state;
            private byte padding1;
            private byte padding2;
        }
#pragma warning restore 0169

        /* Game controller device event (event.cdevice.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_ControllerDeviceEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which; /* joystick id for ADDED,
						 * else instance id
						 */
        }

        // Ignore private members used for padding in this struct
#pragma warning disable 0169
        /* Audio device event (event.adevice.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_AudioDeviceEvent
        {
            public UInt32 type;
            public UInt32 timestamp;
            public UInt32 which;
            public byte iscapture;
            private byte padding1;
            private byte padding2;
            private byte padding3;
        }
#pragma warning restore 0169

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_TouchFingerEvent
        {
            public UInt32 type;
            public UInt32 timestamp;
            public Int64 touchId; // SDL_TouchID
            public Int64 fingerId; // SDL_GestureID
            public float x;
            public float y;
            public float dx;
            public float dy;
            public float pressure;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_MultiGestureEvent
        {
            public UInt32 type;
            public UInt32 timestamp;
            public Int64 touchId; // SDL_TouchID
            public float dTheta;
            public float dDist;
            public float x;
            public float y;
            public UInt16 numFingers;
            public UInt16 padding;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_DollarGestureEvent
        {
            public UInt32 type;
            public UInt32 timestamp;
            public Int64 touchId; // SDL_TouchID
            public Int64 gestureId; // SDL_GestureID
            public UInt32 numFingers;
            public float error;
            public float x;
            public float y;
        }

        /* File open request by system (event.drop.*), enabled by
		 * default
		 */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_DropEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;

            /* char* filename, to be freed.
			 * Access the variable EXACTLY ONCE like this:
			 * string s = SDL.UTF8_ToManaged(evt.drop.file, true);
			 */
            public IntPtr file;
            public UInt32 windowID;
        }

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_SensorEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public Int32 which;
            public fixed float data[6];
        }

        /* The "quit requested" event */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_QuitEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
        }

        /* A user defined event (event.user.*) */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_UserEvent
        {
            public UInt32 type;
            public UInt32 timestamp;
            public UInt32 windowID;
            public Int32 code;
            public IntPtr data1; /* user-defined */
            public IntPtr data2; /* user-defined */
        }

        /* A video driver dependent event (event.syswm.*), disabled */
        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_SysWMEvent
        {
            public SDL_EventType type;
            public UInt32 timestamp;
            public IntPtr msg; /* SDL_SysWMmsg*, system-dependent*/
        }

        /* General event structure */
        // C# doesn't do unions, so we do this ugly thing. */
        [StructLayout(LayoutKind.Explicit)]
        public struct SDL_Event
        {
            [FieldOffset(0)]
            public SDL_EventType type;
            [FieldOffset(0)]
            public SDL_DisplayEvent display;
            [FieldOffset(0)]
            public SDL_WindowEvent window;
            [FieldOffset(0)]
            public SDL_KeyboardEvent key;
            [FieldOffset(0)]
            public SDL_TextEditingEvent edit;
            [FieldOffset(0)]
            public SDL_TextInputEvent text;
            [FieldOffset(0)]
            public SDL_MouseMotionEvent motion;
            [FieldOffset(0)]
            public SDL_MouseButtonEvent button;
            [FieldOffset(0)]
            public SDL_MouseWheelEvent wheel;
            [FieldOffset(0)]
            public SDL_JoyAxisEvent jaxis;
            [FieldOffset(0)]
            public SDL_JoyBallEvent jball;
            [FieldOffset(0)]
            public SDL_JoyHatEvent jhat;
            [FieldOffset(0)]
            public SDL_JoyButtonEvent jbutton;
            [FieldOffset(0)]
            public SDL_JoyDeviceEvent jdevice;
            [FieldOffset(0)]
            public SDL_ControllerAxisEvent caxis;
            [FieldOffset(0)]
            public SDL_ControllerButtonEvent cbutton;
            [FieldOffset(0)]
            public SDL_ControllerDeviceEvent cdevice;
            [FieldOffset(0)]
            public SDL_AudioDeviceEvent adevice;
            [FieldOffset(0)]
            public SDL_SensorEvent sensor;
            [FieldOffset(0)]
            public SDL_QuitEvent quit;
            [FieldOffset(0)]
            public SDL_UserEvent user;
            [FieldOffset(0)]
            public SDL_SysWMEvent syswm;
            [FieldOffset(0)]
            public SDL_TouchFingerEvent tfinger;
            [FieldOffset(0)]
            public SDL_MultiGestureEvent mgesture;
            [FieldOffset(0)]
            public SDL_DollarGestureEvent dgesture;
            [FieldOffset(0)]
            public SDL_DropEvent drop;
        }

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate int SDL_EventFilter(
            IntPtr userdata, // void*
            IntPtr sdlevent // SDL_Event* event, lolC#
        );

        /* Pump the event loop, getting events from the input devices*/
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_PumpEvents();

        public enum SDL_eventaction
        {
            SDL_ADDEVENT,
            SDL_PEEKEVENT,
            SDL_GETEVENT
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_PeepEvents(
            [Out] SDL_Event[] events,
            int numevents,
            SDL_eventaction action,
            SDL_EventType minType,
            SDL_EventType maxType
        );

        /* Checks to see if certain events are in the event queue */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasEvent(SDL_EventType type);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasEvents(
            SDL_EventType minType,
            SDL_EventType maxType
        );

        /* Clears events from the event queue */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FlushEvent(SDL_EventType type);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FlushEvents(
            SDL_EventType min,
            SDL_EventType max
        );

        /* Polls for currently pending events */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_PollEvent(out SDL_Event _event);

        /* Waits indefinitely for the next event */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_WaitEvent(out SDL_Event _event);

        /* Waits until the specified timeout (in ms) for the next event
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_WaitEventTimeout(out SDL_Event _event, int timeout);

        /* Add an event to the event queue */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_PushEvent(ref SDL_Event _event);

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetEventFilter(
            SDL_EventFilter filter,
            IntPtr userdata
        );

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_bool SDL_GetEventFilter(
            out IntPtr filter,
            out IntPtr userdata
        );
        public static SDL_bool SDL_GetEventFilter(
            out SDL_EventFilter filter,
            out IntPtr userdata
        )
        {
            IntPtr result = IntPtr.Zero;
            SDL_bool retval = SDL_GetEventFilter(out result, out userdata);
            if (result != IntPtr.Zero)
            {
                filter = (SDL_EventFilter)Marshal.GetDelegateForFunctionPointer(
                    result,
                    typeof(SDL_EventFilter)
                );
            }
            else
            {
                filter = null;
            }
            return retval;
        }

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_AddEventWatch(
            SDL_EventFilter filter,
            IntPtr userdata
        );

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_DelEventWatch(
            SDL_EventFilter filter,
            IntPtr userdata
        );

        /* userdata refers to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FilterEvents(
            SDL_EventFilter filter,
            IntPtr userdata
        );

        /* These are for SDL_EventState() */
        public const int SDL_QUERY = -1;
        public const int SDL_IGNORE = 0;
        public const int SDL_DISABLE = 0;
        public const int SDL_ENABLE = 1;

        /* This function allows you to enable/disable certain events */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern byte SDL_EventState(SDL_EventType type, int state);

        /* Get the state of an event */
        public static byte SDL_GetEventState(SDL_EventType type)
        {
            return SDL_EventState(type, SDL_QUERY);
        }

        /* Allocate a set of user-defined events */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_RegisterEvents(int numevents);
        #endregion

        #region SDL_scancode.h

        /* Scancodes based off USB keyboard page (0x07) */
        public enum SDL_Scancode
        {
            SDL_SCANCODE_UNKNOWN = 0,

            SDL_SCANCODE_A = 4,
            SDL_SCANCODE_B = 5,
            SDL_SCANCODE_C = 6,
            SDL_SCANCODE_D = 7,
            SDL_SCANCODE_E = 8,
            SDL_SCANCODE_F = 9,
            SDL_SCANCODE_G = 10,
            SDL_SCANCODE_H = 11,
            SDL_SCANCODE_I = 12,
            SDL_SCANCODE_J = 13,
            SDL_SCANCODE_K = 14,
            SDL_SCANCODE_L = 15,
            SDL_SCANCODE_M = 16,
            SDL_SCANCODE_N = 17,
            SDL_SCANCODE_O = 18,
            SDL_SCANCODE_P = 19,
            SDL_SCANCODE_Q = 20,
            SDL_SCANCODE_R = 21,
            SDL_SCANCODE_S = 22,
            SDL_SCANCODE_T = 23,
            SDL_SCANCODE_U = 24,
            SDL_SCANCODE_V = 25,
            SDL_SCANCODE_W = 26,
            SDL_SCANCODE_X = 27,
            SDL_SCANCODE_Y = 28,
            SDL_SCANCODE_Z = 29,

            SDL_SCANCODE_1 = 30,
            SDL_SCANCODE_2 = 31,
            SDL_SCANCODE_3 = 32,
            SDL_SCANCODE_4 = 33,
            SDL_SCANCODE_5 = 34,
            SDL_SCANCODE_6 = 35,
            SDL_SCANCODE_7 = 36,
            SDL_SCANCODE_8 = 37,
            SDL_SCANCODE_9 = 38,
            SDL_SCANCODE_0 = 39,

            SDL_SCANCODE_RETURN = 40,
            SDL_SCANCODE_ESCAPE = 41,
            SDL_SCANCODE_BACKSPACE = 42,
            SDL_SCANCODE_TAB = 43,
            SDL_SCANCODE_SPACE = 44,

            SDL_SCANCODE_MINUS = 45,
            SDL_SCANCODE_EQUALS = 46,
            SDL_SCANCODE_LEFTBRACKET = 47,
            SDL_SCANCODE_RIGHTBRACKET = 48,
            SDL_SCANCODE_BACKSLASH = 49,
            SDL_SCANCODE_NONUSHASH = 50,
            SDL_SCANCODE_SEMICOLON = 51,
            SDL_SCANCODE_APOSTROPHE = 52,
            SDL_SCANCODE_GRAVE = 53,
            SDL_SCANCODE_COMMA = 54,
            SDL_SCANCODE_PERIOD = 55,
            SDL_SCANCODE_SLASH = 56,

            SDL_SCANCODE_CAPSLOCK = 57,

            SDL_SCANCODE_F1 = 58,
            SDL_SCANCODE_F2 = 59,
            SDL_SCANCODE_F3 = 60,
            SDL_SCANCODE_F4 = 61,
            SDL_SCANCODE_F5 = 62,
            SDL_SCANCODE_F6 = 63,
            SDL_SCANCODE_F7 = 64,
            SDL_SCANCODE_F8 = 65,
            SDL_SCANCODE_F9 = 66,
            SDL_SCANCODE_F10 = 67,
            SDL_SCANCODE_F11 = 68,
            SDL_SCANCODE_F12 = 69,

            SDL_SCANCODE_PRINTSCREEN = 70,
            SDL_SCANCODE_SCROLLLOCK = 71,
            SDL_SCANCODE_PAUSE = 72,
            SDL_SCANCODE_INSERT = 73,
            SDL_SCANCODE_HOME = 74,
            SDL_SCANCODE_PAGEUP = 75,
            SDL_SCANCODE_DELETE = 76,
            SDL_SCANCODE_END = 77,
            SDL_SCANCODE_PAGEDOWN = 78,
            SDL_SCANCODE_RIGHT = 79,
            SDL_SCANCODE_LEFT = 80,
            SDL_SCANCODE_DOWN = 81,
            SDL_SCANCODE_UP = 82,

            SDL_SCANCODE_NUMLOCKCLEAR = 83,
            SDL_SCANCODE_KP_DIVIDE = 84,
            SDL_SCANCODE_KP_MULTIPLY = 85,
            SDL_SCANCODE_KP_MINUS = 86,
            SDL_SCANCODE_KP_PLUS = 87,
            SDL_SCANCODE_KP_ENTER = 88,
            SDL_SCANCODE_KP_1 = 89,
            SDL_SCANCODE_KP_2 = 90,
            SDL_SCANCODE_KP_3 = 91,
            SDL_SCANCODE_KP_4 = 92,
            SDL_SCANCODE_KP_5 = 93,
            SDL_SCANCODE_KP_6 = 94,
            SDL_SCANCODE_KP_7 = 95,
            SDL_SCANCODE_KP_8 = 96,
            SDL_SCANCODE_KP_9 = 97,
            SDL_SCANCODE_KP_0 = 98,
            SDL_SCANCODE_KP_PERIOD = 99,

            SDL_SCANCODE_NONUSBACKSLASH = 100,
            SDL_SCANCODE_APPLICATION = 101,
            SDL_SCANCODE_POWER = 102,
            SDL_SCANCODE_KP_EQUALS = 103,
            SDL_SCANCODE_F13 = 104,
            SDL_SCANCODE_F14 = 105,
            SDL_SCANCODE_F15 = 106,
            SDL_SCANCODE_F16 = 107,
            SDL_SCANCODE_F17 = 108,
            SDL_SCANCODE_F18 = 109,
            SDL_SCANCODE_F19 = 110,
            SDL_SCANCODE_F20 = 111,
            SDL_SCANCODE_F21 = 112,
            SDL_SCANCODE_F22 = 113,
            SDL_SCANCODE_F23 = 114,
            SDL_SCANCODE_F24 = 115,
            SDL_SCANCODE_EXECUTE = 116,
            SDL_SCANCODE_HELP = 117,
            SDL_SCANCODE_MENU = 118,
            SDL_SCANCODE_SELECT = 119,
            SDL_SCANCODE_STOP = 120,
            SDL_SCANCODE_AGAIN = 121,
            SDL_SCANCODE_UNDO = 122,
            SDL_SCANCODE_CUT = 123,
            SDL_SCANCODE_COPY = 124,
            SDL_SCANCODE_PASTE = 125,
            SDL_SCANCODE_FIND = 126,
            SDL_SCANCODE_MUTE = 127,
            SDL_SCANCODE_VOLUMEUP = 128,
            SDL_SCANCODE_VOLUMEDOWN = 129,
            /* not sure whether there's a reason to enable these */
            /*	SDL_SCANCODE_LOCKINGCAPSLOCK = 130, */
            /*	SDL_SCANCODE_LOCKINGNUMLOCK = 131, */
            /*	SDL_SCANCODE_LOCKINGSCROLLLOCK = 132, */
            SDL_SCANCODE_KP_COMMA = 133,
            SDL_SCANCODE_KP_EQUALSAS400 = 134,

            SDL_SCANCODE_INTERNATIONAL1 = 135,
            SDL_SCANCODE_INTERNATIONAL2 = 136,
            SDL_SCANCODE_INTERNATIONAL3 = 137,
            SDL_SCANCODE_INTERNATIONAL4 = 138,
            SDL_SCANCODE_INTERNATIONAL5 = 139,
            SDL_SCANCODE_INTERNATIONAL6 = 140,
            SDL_SCANCODE_INTERNATIONAL7 = 141,
            SDL_SCANCODE_INTERNATIONAL8 = 142,
            SDL_SCANCODE_INTERNATIONAL9 = 143,
            SDL_SCANCODE_LANG1 = 144,
            SDL_SCANCODE_LANG2 = 145,
            SDL_SCANCODE_LANG3 = 146,
            SDL_SCANCODE_LANG4 = 147,
            SDL_SCANCODE_LANG5 = 148,
            SDL_SCANCODE_LANG6 = 149,
            SDL_SCANCODE_LANG7 = 150,
            SDL_SCANCODE_LANG8 = 151,
            SDL_SCANCODE_LANG9 = 152,

            SDL_SCANCODE_ALTERASE = 153,
            SDL_SCANCODE_SYSREQ = 154,
            SDL_SCANCODE_CANCEL = 155,
            SDL_SCANCODE_CLEAR = 156,
            SDL_SCANCODE_PRIOR = 157,
            SDL_SCANCODE_RETURN2 = 158,
            SDL_SCANCODE_SEPARATOR = 159,
            SDL_SCANCODE_OUT = 160,
            SDL_SCANCODE_OPER = 161,
            SDL_SCANCODE_CLEARAGAIN = 162,
            SDL_SCANCODE_CRSEL = 163,
            SDL_SCANCODE_EXSEL = 164,

            SDL_SCANCODE_KP_00 = 176,
            SDL_SCANCODE_KP_000 = 177,
            SDL_SCANCODE_THOUSANDSSEPARATOR = 178,
            SDL_SCANCODE_DECIMALSEPARATOR = 179,
            SDL_SCANCODE_CURRENCYUNIT = 180,
            SDL_SCANCODE_CURRENCYSUBUNIT = 181,
            SDL_SCANCODE_KP_LEFTPAREN = 182,
            SDL_SCANCODE_KP_RIGHTPAREN = 183,
            SDL_SCANCODE_KP_LEFTBRACE = 184,
            SDL_SCANCODE_KP_RIGHTBRACE = 185,
            SDL_SCANCODE_KP_TAB = 186,
            SDL_SCANCODE_KP_BACKSPACE = 187,
            SDL_SCANCODE_KP_A = 188,
            SDL_SCANCODE_KP_B = 189,
            SDL_SCANCODE_KP_C = 190,
            SDL_SCANCODE_KP_D = 191,
            SDL_SCANCODE_KP_E = 192,
            SDL_SCANCODE_KP_F = 193,
            SDL_SCANCODE_KP_XOR = 194,
            SDL_SCANCODE_KP_POWER = 195,
            SDL_SCANCODE_KP_PERCENT = 196,
            SDL_SCANCODE_KP_LESS = 197,
            SDL_SCANCODE_KP_GREATER = 198,
            SDL_SCANCODE_KP_AMPERSAND = 199,
            SDL_SCANCODE_KP_DBLAMPERSAND = 200,
            SDL_SCANCODE_KP_VERTICALBAR = 201,
            SDL_SCANCODE_KP_DBLVERTICALBAR = 202,
            SDL_SCANCODE_KP_COLON = 203,
            SDL_SCANCODE_KP_HASH = 204,
            SDL_SCANCODE_KP_SPACE = 205,
            SDL_SCANCODE_KP_AT = 206,
            SDL_SCANCODE_KP_EXCLAM = 207,
            SDL_SCANCODE_KP_MEMSTORE = 208,
            SDL_SCANCODE_KP_MEMRECALL = 209,
            SDL_SCANCODE_KP_MEMCLEAR = 210,
            SDL_SCANCODE_KP_MEMADD = 211,
            SDL_SCANCODE_KP_MEMSUBTRACT = 212,
            SDL_SCANCODE_KP_MEMMULTIPLY = 213,
            SDL_SCANCODE_KP_MEMDIVIDE = 214,
            SDL_SCANCODE_KP_PLUSMINUS = 215,
            SDL_SCANCODE_KP_CLEAR = 216,
            SDL_SCANCODE_KP_CLEARENTRY = 217,
            SDL_SCANCODE_KP_BINARY = 218,
            SDL_SCANCODE_KP_OCTAL = 219,
            SDL_SCANCODE_KP_DECIMAL = 220,
            SDL_SCANCODE_KP_HEXADECIMAL = 221,

            SDL_SCANCODE_LCTRL = 224,
            SDL_SCANCODE_LSHIFT = 225,
            SDL_SCANCODE_LALT = 226,
            SDL_SCANCODE_LGUI = 227,
            SDL_SCANCODE_RCTRL = 228,
            SDL_SCANCODE_RSHIFT = 229,
            SDL_SCANCODE_RALT = 230,
            SDL_SCANCODE_RGUI = 231,

            SDL_SCANCODE_MODE = 257,

            /* These come from the USB consumer page (0x0C) */
            SDL_SCANCODE_AUDIONEXT = 258,
            SDL_SCANCODE_AUDIOPREV = 259,
            SDL_SCANCODE_AUDIOSTOP = 260,
            SDL_SCANCODE_AUDIOPLAY = 261,
            SDL_SCANCODE_AUDIOMUTE = 262,
            SDL_SCANCODE_MEDIASELECT = 263,
            SDL_SCANCODE_WWW = 264,
            SDL_SCANCODE_MAIL = 265,
            SDL_SCANCODE_CALCULATOR = 266,
            SDL_SCANCODE_COMPUTER = 267,
            SDL_SCANCODE_AC_SEARCH = 268,
            SDL_SCANCODE_AC_HOME = 269,
            SDL_SCANCODE_AC_BACK = 270,
            SDL_SCANCODE_AC_FORWARD = 271,
            SDL_SCANCODE_AC_STOP = 272,
            SDL_SCANCODE_AC_REFRESH = 273,
            SDL_SCANCODE_AC_BOOKMARKS = 274,

            /* These come from other sources, and are mostly mac related */
            SDL_SCANCODE_BRIGHTNESSDOWN = 275,
            SDL_SCANCODE_BRIGHTNESSUP = 276,
            SDL_SCANCODE_DISPLAYSWITCH = 277,
            SDL_SCANCODE_KBDILLUMTOGGLE = 278,
            SDL_SCANCODE_KBDILLUMDOWN = 279,
            SDL_SCANCODE_KBDILLUMUP = 280,
            SDL_SCANCODE_EJECT = 281,
            SDL_SCANCODE_SLEEP = 282,

            SDL_SCANCODE_APP1 = 283,
            SDL_SCANCODE_APP2 = 284,

            /* These come from the USB consumer page (0x0C) */
            SDL_SCANCODE_AUDIOREWIND = 285,
            SDL_SCANCODE_AUDIOFASTFORWARD = 286,

            /* This is not a key, simply marks the number of scancodes
			 * so that you know how big to make your arrays. */
            SDL_NUM_SCANCODES = 512
        }

        #endregion

        #region SDL_keycode.h

        public const int SDLK_SCANCODE_MASK = (1 << 30);
        public static SDL_Keycode SDL_SCANCODE_TO_KEYCODE(SDL_Scancode X)
        {
            return (SDL_Keycode)((int)X | SDLK_SCANCODE_MASK);
        }

        /* So, in the C headers, SDL_Keycode is a typedef of Sint32
		 * and all of the names are in an anonymous enum. Yeah...
		 * that's not going to cut it for C#. We'll just put them in an
		 * enum for now? */
        public enum SDL_Keycode
        {
            SDLK_UNKNOWN = 0,

            SDLK_RETURN = '\r',
            SDLK_ESCAPE = 27, // '\033'
            SDLK_BACKSPACE = '\b',
            SDLK_TAB = '\t',
            SDLK_SPACE = ' ',
            SDLK_EXCLAIM = '!',
            SDLK_QUOTEDBL = '"',
            SDLK_HASH = '#',
            SDLK_PERCENT = '%',
            SDLK_DOLLAR = '$',
            SDLK_AMPERSAND = '&',
            SDLK_QUOTE = '\'',
            SDLK_LEFTPAREN = '(',
            SDLK_RIGHTPAREN = ')',
            SDLK_ASTERISK = '*',
            SDLK_PLUS = '+',
            SDLK_COMMA = ',',
            SDLK_MINUS = '-',
            SDLK_PERIOD = '.',
            SDLK_SLASH = '/',
            SDLK_0 = '0',
            SDLK_1 = '1',
            SDLK_2 = '2',
            SDLK_3 = '3',
            SDLK_4 = '4',
            SDLK_5 = '5',
            SDLK_6 = '6',
            SDLK_7 = '7',
            SDLK_8 = '8',
            SDLK_9 = '9',
            SDLK_COLON = ':',
            SDLK_SEMICOLON = ';',
            SDLK_LESS = '<',
            SDLK_EQUALS = '=',
            SDLK_GREATER = '>',
            SDLK_QUESTION = '?',
            SDLK_AT = '@',
            /*
			Skip uppercase letters
			*/
            SDLK_LEFTBRACKET = '[',
            SDLK_BACKSLASH = '\\',
            SDLK_RIGHTBRACKET = ']',
            SDLK_CARET = '^',
            SDLK_UNDERSCORE = '_',
            SDLK_BACKQUOTE = '`',
            SDLK_a = 'a',
            SDLK_b = 'b',
            SDLK_c = 'c',
            SDLK_d = 'd',
            SDLK_e = 'e',
            SDLK_f = 'f',
            SDLK_g = 'g',
            SDLK_h = 'h',
            SDLK_i = 'i',
            SDLK_j = 'j',
            SDLK_k = 'k',
            SDLK_l = 'l',
            SDLK_m = 'm',
            SDLK_n = 'n',
            SDLK_o = 'o',
            SDLK_p = 'p',
            SDLK_q = 'q',
            SDLK_r = 'r',
            SDLK_s = 's',
            SDLK_t = 't',
            SDLK_u = 'u',
            SDLK_v = 'v',
            SDLK_w = 'w',
            SDLK_x = 'x',
            SDLK_y = 'y',
            SDLK_z = 'z',

            SDLK_CAPSLOCK = (int)SDL_Scancode.SDL_SCANCODE_CAPSLOCK | SDLK_SCANCODE_MASK,

            SDLK_F1 = (int)SDL_Scancode.SDL_SCANCODE_F1 | SDLK_SCANCODE_MASK,
            SDLK_F2 = (int)SDL_Scancode.SDL_SCANCODE_F2 | SDLK_SCANCODE_MASK,
            SDLK_F3 = (int)SDL_Scancode.SDL_SCANCODE_F3 | SDLK_SCANCODE_MASK,
            SDLK_F4 = (int)SDL_Scancode.SDL_SCANCODE_F4 | SDLK_SCANCODE_MASK,
            SDLK_F5 = (int)SDL_Scancode.SDL_SCANCODE_F5 | SDLK_SCANCODE_MASK,
            SDLK_F6 = (int)SDL_Scancode.SDL_SCANCODE_F6 | SDLK_SCANCODE_MASK,
            SDLK_F7 = (int)SDL_Scancode.SDL_SCANCODE_F7 | SDLK_SCANCODE_MASK,
            SDLK_F8 = (int)SDL_Scancode.SDL_SCANCODE_F8 | SDLK_SCANCODE_MASK,
            SDLK_F9 = (int)SDL_Scancode.SDL_SCANCODE_F9 | SDLK_SCANCODE_MASK,
            SDLK_F10 = (int)SDL_Scancode.SDL_SCANCODE_F10 | SDLK_SCANCODE_MASK,
            SDLK_F11 = (int)SDL_Scancode.SDL_SCANCODE_F11 | SDLK_SCANCODE_MASK,
            SDLK_F12 = (int)SDL_Scancode.SDL_SCANCODE_F12 | SDLK_SCANCODE_MASK,

            SDLK_PRINTSCREEN = (int)SDL_Scancode.SDL_SCANCODE_PRINTSCREEN | SDLK_SCANCODE_MASK,
            SDLK_SCROLLLOCK = (int)SDL_Scancode.SDL_SCANCODE_SCROLLLOCK | SDLK_SCANCODE_MASK,
            SDLK_PAUSE = (int)SDL_Scancode.SDL_SCANCODE_PAUSE | SDLK_SCANCODE_MASK,
            SDLK_INSERT = (int)SDL_Scancode.SDL_SCANCODE_INSERT | SDLK_SCANCODE_MASK,
            SDLK_HOME = (int)SDL_Scancode.SDL_SCANCODE_HOME | SDLK_SCANCODE_MASK,
            SDLK_PAGEUP = (int)SDL_Scancode.SDL_SCANCODE_PAGEUP | SDLK_SCANCODE_MASK,
            SDLK_DELETE = 127,
            SDLK_END = (int)SDL_Scancode.SDL_SCANCODE_END | SDLK_SCANCODE_MASK,
            SDLK_PAGEDOWN = (int)SDL_Scancode.SDL_SCANCODE_PAGEDOWN | SDLK_SCANCODE_MASK,
            SDLK_RIGHT = (int)SDL_Scancode.SDL_SCANCODE_RIGHT | SDLK_SCANCODE_MASK,
            SDLK_LEFT = (int)SDL_Scancode.SDL_SCANCODE_LEFT | SDLK_SCANCODE_MASK,
            SDLK_DOWN = (int)SDL_Scancode.SDL_SCANCODE_DOWN | SDLK_SCANCODE_MASK,
            SDLK_UP = (int)SDL_Scancode.SDL_SCANCODE_UP | SDLK_SCANCODE_MASK,

            SDLK_NUMLOCKCLEAR = (int)SDL_Scancode.SDL_SCANCODE_NUMLOCKCLEAR | SDLK_SCANCODE_MASK,
            SDLK_KP_DIVIDE = (int)SDL_Scancode.SDL_SCANCODE_KP_DIVIDE | SDLK_SCANCODE_MASK,
            SDLK_KP_MULTIPLY = (int)SDL_Scancode.SDL_SCANCODE_KP_MULTIPLY | SDLK_SCANCODE_MASK,
            SDLK_KP_MINUS = (int)SDL_Scancode.SDL_SCANCODE_KP_MINUS | SDLK_SCANCODE_MASK,
            SDLK_KP_PLUS = (int)SDL_Scancode.SDL_SCANCODE_KP_PLUS | SDLK_SCANCODE_MASK,
            SDLK_KP_ENTER = (int)SDL_Scancode.SDL_SCANCODE_KP_ENTER | SDLK_SCANCODE_MASK,
            SDLK_KP_1 = (int)SDL_Scancode.SDL_SCANCODE_KP_1 | SDLK_SCANCODE_MASK,
            SDLK_KP_2 = (int)SDL_Scancode.SDL_SCANCODE_KP_2 | SDLK_SCANCODE_MASK,
            SDLK_KP_3 = (int)SDL_Scancode.SDL_SCANCODE_KP_3 | SDLK_SCANCODE_MASK,
            SDLK_KP_4 = (int)SDL_Scancode.SDL_SCANCODE_KP_4 | SDLK_SCANCODE_MASK,
            SDLK_KP_5 = (int)SDL_Scancode.SDL_SCANCODE_KP_5 | SDLK_SCANCODE_MASK,
            SDLK_KP_6 = (int)SDL_Scancode.SDL_SCANCODE_KP_6 | SDLK_SCANCODE_MASK,
            SDLK_KP_7 = (int)SDL_Scancode.SDL_SCANCODE_KP_7 | SDLK_SCANCODE_MASK,
            SDLK_KP_8 = (int)SDL_Scancode.SDL_SCANCODE_KP_8 | SDLK_SCANCODE_MASK,
            SDLK_KP_9 = (int)SDL_Scancode.SDL_SCANCODE_KP_9 | SDLK_SCANCODE_MASK,
            SDLK_KP_0 = (int)SDL_Scancode.SDL_SCANCODE_KP_0 | SDLK_SCANCODE_MASK,
            SDLK_KP_PERIOD = (int)SDL_Scancode.SDL_SCANCODE_KP_PERIOD | SDLK_SCANCODE_MASK,

            SDLK_APPLICATION = (int)SDL_Scancode.SDL_SCANCODE_APPLICATION | SDLK_SCANCODE_MASK,
            SDLK_POWER = (int)SDL_Scancode.SDL_SCANCODE_POWER | SDLK_SCANCODE_MASK,
            SDLK_KP_EQUALS = (int)SDL_Scancode.SDL_SCANCODE_KP_EQUALS | SDLK_SCANCODE_MASK,
            SDLK_F13 = (int)SDL_Scancode.SDL_SCANCODE_F13 | SDLK_SCANCODE_MASK,
            SDLK_F14 = (int)SDL_Scancode.SDL_SCANCODE_F14 | SDLK_SCANCODE_MASK,
            SDLK_F15 = (int)SDL_Scancode.SDL_SCANCODE_F15 | SDLK_SCANCODE_MASK,
            SDLK_F16 = (int)SDL_Scancode.SDL_SCANCODE_F16 | SDLK_SCANCODE_MASK,
            SDLK_F17 = (int)SDL_Scancode.SDL_SCANCODE_F17 | SDLK_SCANCODE_MASK,
            SDLK_F18 = (int)SDL_Scancode.SDL_SCANCODE_F18 | SDLK_SCANCODE_MASK,
            SDLK_F19 = (int)SDL_Scancode.SDL_SCANCODE_F19 | SDLK_SCANCODE_MASK,
            SDLK_F20 = (int)SDL_Scancode.SDL_SCANCODE_F20 | SDLK_SCANCODE_MASK,
            SDLK_F21 = (int)SDL_Scancode.SDL_SCANCODE_F21 | SDLK_SCANCODE_MASK,
            SDLK_F22 = (int)SDL_Scancode.SDL_SCANCODE_F22 | SDLK_SCANCODE_MASK,
            SDLK_F23 = (int)SDL_Scancode.SDL_SCANCODE_F23 | SDLK_SCANCODE_MASK,
            SDLK_F24 = (int)SDL_Scancode.SDL_SCANCODE_F24 | SDLK_SCANCODE_MASK,
            SDLK_EXECUTE = (int)SDL_Scancode.SDL_SCANCODE_EXECUTE | SDLK_SCANCODE_MASK,
            SDLK_HELP = (int)SDL_Scancode.SDL_SCANCODE_HELP | SDLK_SCANCODE_MASK,
            SDLK_MENU = (int)SDL_Scancode.SDL_SCANCODE_MENU | SDLK_SCANCODE_MASK,
            SDLK_SELECT = (int)SDL_Scancode.SDL_SCANCODE_SELECT | SDLK_SCANCODE_MASK,
            SDLK_STOP = (int)SDL_Scancode.SDL_SCANCODE_STOP | SDLK_SCANCODE_MASK,
            SDLK_AGAIN = (int)SDL_Scancode.SDL_SCANCODE_AGAIN | SDLK_SCANCODE_MASK,
            SDLK_UNDO = (int)SDL_Scancode.SDL_SCANCODE_UNDO | SDLK_SCANCODE_MASK,
            SDLK_CUT = (int)SDL_Scancode.SDL_SCANCODE_CUT | SDLK_SCANCODE_MASK,
            SDLK_COPY = (int)SDL_Scancode.SDL_SCANCODE_COPY | SDLK_SCANCODE_MASK,
            SDLK_PASTE = (int)SDL_Scancode.SDL_SCANCODE_PASTE | SDLK_SCANCODE_MASK,
            SDLK_FIND = (int)SDL_Scancode.SDL_SCANCODE_FIND | SDLK_SCANCODE_MASK,
            SDLK_MUTE = (int)SDL_Scancode.SDL_SCANCODE_MUTE | SDLK_SCANCODE_MASK,
            SDLK_VOLUMEUP = (int)SDL_Scancode.SDL_SCANCODE_VOLUMEUP | SDLK_SCANCODE_MASK,
            SDLK_VOLUMEDOWN = (int)SDL_Scancode.SDL_SCANCODE_VOLUMEDOWN | SDLK_SCANCODE_MASK,
            SDLK_KP_COMMA = (int)SDL_Scancode.SDL_SCANCODE_KP_COMMA | SDLK_SCANCODE_MASK,
            SDLK_KP_EQUALSAS400 =
            (int)SDL_Scancode.SDL_SCANCODE_KP_EQUALSAS400 | SDLK_SCANCODE_MASK,

            SDLK_ALTERASE = (int)SDL_Scancode.SDL_SCANCODE_ALTERASE | SDLK_SCANCODE_MASK,
            SDLK_SYSREQ = (int)SDL_Scancode.SDL_SCANCODE_SYSREQ | SDLK_SCANCODE_MASK,
            SDLK_CANCEL = (int)SDL_Scancode.SDL_SCANCODE_CANCEL | SDLK_SCANCODE_MASK,
            SDLK_CLEAR = (int)SDL_Scancode.SDL_SCANCODE_CLEAR | SDLK_SCANCODE_MASK,
            SDLK_PRIOR = (int)SDL_Scancode.SDL_SCANCODE_PRIOR | SDLK_SCANCODE_MASK,
            SDLK_RETURN2 = (int)SDL_Scancode.SDL_SCANCODE_RETURN2 | SDLK_SCANCODE_MASK,
            SDLK_SEPARATOR = (int)SDL_Scancode.SDL_SCANCODE_SEPARATOR | SDLK_SCANCODE_MASK,
            SDLK_OUT = (int)SDL_Scancode.SDL_SCANCODE_OUT | SDLK_SCANCODE_MASK,
            SDLK_OPER = (int)SDL_Scancode.SDL_SCANCODE_OPER | SDLK_SCANCODE_MASK,
            SDLK_CLEARAGAIN = (int)SDL_Scancode.SDL_SCANCODE_CLEARAGAIN | SDLK_SCANCODE_MASK,
            SDLK_CRSEL = (int)SDL_Scancode.SDL_SCANCODE_CRSEL | SDLK_SCANCODE_MASK,
            SDLK_EXSEL = (int)SDL_Scancode.SDL_SCANCODE_EXSEL | SDLK_SCANCODE_MASK,

            SDLK_KP_00 = (int)SDL_Scancode.SDL_SCANCODE_KP_00 | SDLK_SCANCODE_MASK,
            SDLK_KP_000 = (int)SDL_Scancode.SDL_SCANCODE_KP_000 | SDLK_SCANCODE_MASK,
            SDLK_THOUSANDSSEPARATOR =
            (int)SDL_Scancode.SDL_SCANCODE_THOUSANDSSEPARATOR | SDLK_SCANCODE_MASK,
            SDLK_DECIMALSEPARATOR =
            (int)SDL_Scancode.SDL_SCANCODE_DECIMALSEPARATOR | SDLK_SCANCODE_MASK,
            SDLK_CURRENCYUNIT = (int)SDL_Scancode.SDL_SCANCODE_CURRENCYUNIT | SDLK_SCANCODE_MASK,
            SDLK_CURRENCYSUBUNIT =
            (int)SDL_Scancode.SDL_SCANCODE_CURRENCYSUBUNIT | SDLK_SCANCODE_MASK,
            SDLK_KP_LEFTPAREN = (int)SDL_Scancode.SDL_SCANCODE_KP_LEFTPAREN | SDLK_SCANCODE_MASK,
            SDLK_KP_RIGHTPAREN = (int)SDL_Scancode.SDL_SCANCODE_KP_RIGHTPAREN | SDLK_SCANCODE_MASK,
            SDLK_KP_LEFTBRACE = (int)SDL_Scancode.SDL_SCANCODE_KP_LEFTBRACE | SDLK_SCANCODE_MASK,
            SDLK_KP_RIGHTBRACE = (int)SDL_Scancode.SDL_SCANCODE_KP_RIGHTBRACE | SDLK_SCANCODE_MASK,
            SDLK_KP_TAB = (int)SDL_Scancode.SDL_SCANCODE_KP_TAB | SDLK_SCANCODE_MASK,
            SDLK_KP_BACKSPACE = (int)SDL_Scancode.SDL_SCANCODE_KP_BACKSPACE | SDLK_SCANCODE_MASK,
            SDLK_KP_A = (int)SDL_Scancode.SDL_SCANCODE_KP_A | SDLK_SCANCODE_MASK,
            SDLK_KP_B = (int)SDL_Scancode.SDL_SCANCODE_KP_B | SDLK_SCANCODE_MASK,
            SDLK_KP_C = (int)SDL_Scancode.SDL_SCANCODE_KP_C | SDLK_SCANCODE_MASK,
            SDLK_KP_D = (int)SDL_Scancode.SDL_SCANCODE_KP_D | SDLK_SCANCODE_MASK,
            SDLK_KP_E = (int)SDL_Scancode.SDL_SCANCODE_KP_E | SDLK_SCANCODE_MASK,
            SDLK_KP_F = (int)SDL_Scancode.SDL_SCANCODE_KP_F | SDLK_SCANCODE_MASK,
            SDLK_KP_XOR = (int)SDL_Scancode.SDL_SCANCODE_KP_XOR | SDLK_SCANCODE_MASK,
            SDLK_KP_POWER = (int)SDL_Scancode.SDL_SCANCODE_KP_POWER | SDLK_SCANCODE_MASK,
            SDLK_KP_PERCENT = (int)SDL_Scancode.SDL_SCANCODE_KP_PERCENT | SDLK_SCANCODE_MASK,
            SDLK_KP_LESS = (int)SDL_Scancode.SDL_SCANCODE_KP_LESS | SDLK_SCANCODE_MASK,
            SDLK_KP_GREATER = (int)SDL_Scancode.SDL_SCANCODE_KP_GREATER | SDLK_SCANCODE_MASK,
            SDLK_KP_AMPERSAND = (int)SDL_Scancode.SDL_SCANCODE_KP_AMPERSAND | SDLK_SCANCODE_MASK,
            SDLK_KP_DBLAMPERSAND =
            (int)SDL_Scancode.SDL_SCANCODE_KP_DBLAMPERSAND | SDLK_SCANCODE_MASK,
            SDLK_KP_VERTICALBAR =
            (int)SDL_Scancode.SDL_SCANCODE_KP_VERTICALBAR | SDLK_SCANCODE_MASK,
            SDLK_KP_DBLVERTICALBAR =
            (int)SDL_Scancode.SDL_SCANCODE_KP_DBLVERTICALBAR | SDLK_SCANCODE_MASK,
            SDLK_KP_COLON = (int)SDL_Scancode.SDL_SCANCODE_KP_COLON | SDLK_SCANCODE_MASK,
            SDLK_KP_HASH = (int)SDL_Scancode.SDL_SCANCODE_KP_HASH | SDLK_SCANCODE_MASK,
            SDLK_KP_SPACE = (int)SDL_Scancode.SDL_SCANCODE_KP_SPACE | SDLK_SCANCODE_MASK,
            SDLK_KP_AT = (int)SDL_Scancode.SDL_SCANCODE_KP_AT | SDLK_SCANCODE_MASK,
            SDLK_KP_EXCLAM = (int)SDL_Scancode.SDL_SCANCODE_KP_EXCLAM | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMSTORE = (int)SDL_Scancode.SDL_SCANCODE_KP_MEMSTORE | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMRECALL = (int)SDL_Scancode.SDL_SCANCODE_KP_MEMRECALL | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMCLEAR = (int)SDL_Scancode.SDL_SCANCODE_KP_MEMCLEAR | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMADD = (int)SDL_Scancode.SDL_SCANCODE_KP_MEMADD | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMSUBTRACT =
            (int)SDL_Scancode.SDL_SCANCODE_KP_MEMSUBTRACT | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMMULTIPLY =
            (int)SDL_Scancode.SDL_SCANCODE_KP_MEMMULTIPLY | SDLK_SCANCODE_MASK,
            SDLK_KP_MEMDIVIDE = (int)SDL_Scancode.SDL_SCANCODE_KP_MEMDIVIDE | SDLK_SCANCODE_MASK,
            SDLK_KP_PLUSMINUS = (int)SDL_Scancode.SDL_SCANCODE_KP_PLUSMINUS | SDLK_SCANCODE_MASK,
            SDLK_KP_CLEAR = (int)SDL_Scancode.SDL_SCANCODE_KP_CLEAR | SDLK_SCANCODE_MASK,
            SDLK_KP_CLEARENTRY = (int)SDL_Scancode.SDL_SCANCODE_KP_CLEARENTRY | SDLK_SCANCODE_MASK,
            SDLK_KP_BINARY = (int)SDL_Scancode.SDL_SCANCODE_KP_BINARY | SDLK_SCANCODE_MASK,
            SDLK_KP_OCTAL = (int)SDL_Scancode.SDL_SCANCODE_KP_OCTAL | SDLK_SCANCODE_MASK,
            SDLK_KP_DECIMAL = (int)SDL_Scancode.SDL_SCANCODE_KP_DECIMAL | SDLK_SCANCODE_MASK,
            SDLK_KP_HEXADECIMAL =
            (int)SDL_Scancode.SDL_SCANCODE_KP_HEXADECIMAL | SDLK_SCANCODE_MASK,

            SDLK_LCTRL = (int)SDL_Scancode.SDL_SCANCODE_LCTRL | SDLK_SCANCODE_MASK,
            SDLK_LSHIFT = (int)SDL_Scancode.SDL_SCANCODE_LSHIFT | SDLK_SCANCODE_MASK,
            SDLK_LALT = (int)SDL_Scancode.SDL_SCANCODE_LALT | SDLK_SCANCODE_MASK,
            SDLK_LGUI = (int)SDL_Scancode.SDL_SCANCODE_LGUI | SDLK_SCANCODE_MASK,
            SDLK_RCTRL = (int)SDL_Scancode.SDL_SCANCODE_RCTRL | SDLK_SCANCODE_MASK,
            SDLK_RSHIFT = (int)SDL_Scancode.SDL_SCANCODE_RSHIFT | SDLK_SCANCODE_MASK,
            SDLK_RALT = (int)SDL_Scancode.SDL_SCANCODE_RALT | SDLK_SCANCODE_MASK,
            SDLK_RGUI = (int)SDL_Scancode.SDL_SCANCODE_RGUI | SDLK_SCANCODE_MASK,

            SDLK_MODE = (int)SDL_Scancode.SDL_SCANCODE_MODE | SDLK_SCANCODE_MASK,

            SDLK_AUDIONEXT = (int)SDL_Scancode.SDL_SCANCODE_AUDIONEXT | SDLK_SCANCODE_MASK,
            SDLK_AUDIOPREV = (int)SDL_Scancode.SDL_SCANCODE_AUDIOPREV | SDLK_SCANCODE_MASK,
            SDLK_AUDIOSTOP = (int)SDL_Scancode.SDL_SCANCODE_AUDIOSTOP | SDLK_SCANCODE_MASK,
            SDLK_AUDIOPLAY = (int)SDL_Scancode.SDL_SCANCODE_AUDIOPLAY | SDLK_SCANCODE_MASK,
            SDLK_AUDIOMUTE = (int)SDL_Scancode.SDL_SCANCODE_AUDIOMUTE | SDLK_SCANCODE_MASK,
            SDLK_MEDIASELECT = (int)SDL_Scancode.SDL_SCANCODE_MEDIASELECT | SDLK_SCANCODE_MASK,
            SDLK_WWW = (int)SDL_Scancode.SDL_SCANCODE_WWW | SDLK_SCANCODE_MASK,
            SDLK_MAIL = (int)SDL_Scancode.SDL_SCANCODE_MAIL | SDLK_SCANCODE_MASK,
            SDLK_CALCULATOR = (int)SDL_Scancode.SDL_SCANCODE_CALCULATOR | SDLK_SCANCODE_MASK,
            SDLK_COMPUTER = (int)SDL_Scancode.SDL_SCANCODE_COMPUTER | SDLK_SCANCODE_MASK,
            SDLK_AC_SEARCH = (int)SDL_Scancode.SDL_SCANCODE_AC_SEARCH | SDLK_SCANCODE_MASK,
            SDLK_AC_HOME = (int)SDL_Scancode.SDL_SCANCODE_AC_HOME | SDLK_SCANCODE_MASK,
            SDLK_AC_BACK = (int)SDL_Scancode.SDL_SCANCODE_AC_BACK | SDLK_SCANCODE_MASK,
            SDLK_AC_FORWARD = (int)SDL_Scancode.SDL_SCANCODE_AC_FORWARD | SDLK_SCANCODE_MASK,
            SDLK_AC_STOP = (int)SDL_Scancode.SDL_SCANCODE_AC_STOP | SDLK_SCANCODE_MASK,
            SDLK_AC_REFRESH = (int)SDL_Scancode.SDL_SCANCODE_AC_REFRESH | SDLK_SCANCODE_MASK,
            SDLK_AC_BOOKMARKS = (int)SDL_Scancode.SDL_SCANCODE_AC_BOOKMARKS | SDLK_SCANCODE_MASK,

            SDLK_BRIGHTNESSDOWN =
            (int)SDL_Scancode.SDL_SCANCODE_BRIGHTNESSDOWN | SDLK_SCANCODE_MASK,
            SDLK_BRIGHTNESSUP = (int)SDL_Scancode.SDL_SCANCODE_BRIGHTNESSUP | SDLK_SCANCODE_MASK,
            SDLK_DISPLAYSWITCH = (int)SDL_Scancode.SDL_SCANCODE_DISPLAYSWITCH | SDLK_SCANCODE_MASK,
            SDLK_KBDILLUMTOGGLE =
            (int)SDL_Scancode.SDL_SCANCODE_KBDILLUMTOGGLE | SDLK_SCANCODE_MASK,
            SDLK_KBDILLUMDOWN = (int)SDL_Scancode.SDL_SCANCODE_KBDILLUMDOWN | SDLK_SCANCODE_MASK,
            SDLK_KBDILLUMUP = (int)SDL_Scancode.SDL_SCANCODE_KBDILLUMUP | SDLK_SCANCODE_MASK,
            SDLK_EJECT = (int)SDL_Scancode.SDL_SCANCODE_EJECT | SDLK_SCANCODE_MASK,
            SDLK_SLEEP = (int)SDL_Scancode.SDL_SCANCODE_SLEEP | SDLK_SCANCODE_MASK,
            SDLK_APP1 = (int)SDL_Scancode.SDL_SCANCODE_APP1 | SDLK_SCANCODE_MASK,
            SDLK_APP2 = (int)SDL_Scancode.SDL_SCANCODE_APP2 | SDLK_SCANCODE_MASK,

            SDLK_AUDIOREWIND = (int)SDL_Scancode.SDL_SCANCODE_AUDIOREWIND | SDLK_SCANCODE_MASK,
            SDLK_AUDIOFASTFORWARD = (int)SDL_Scancode.SDL_SCANCODE_AUDIOFASTFORWARD | SDLK_SCANCODE_MASK
        }

        /* Key modifiers (bitfield) */
        [Flags]
        public enum SDL_Keymod : ushort
        {
            KMOD_NONE = 0x0000,
            KMOD_LSHIFT = 0x0001,
            KMOD_RSHIFT = 0x0002,
            KMOD_LCTRL = 0x0040,
            KMOD_RCTRL = 0x0080,
            KMOD_LALT = 0x0100,
            KMOD_RALT = 0x0200,
            KMOD_LGUI = 0x0400,
            KMOD_RGUI = 0x0800,
            KMOD_NUM = 0x1000,
            KMOD_CAPS = 0x2000,
            KMOD_MODE = 0x4000,
            KMOD_RESERVED = 0x8000,

            /* These are defines in the SDL headers */
            KMOD_CTRL = (KMOD_LCTRL | KMOD_RCTRL),
            KMOD_SHIFT = (KMOD_LSHIFT | KMOD_RSHIFT),
            KMOD_ALT = (KMOD_LALT | KMOD_RALT),
            KMOD_GUI = (KMOD_LGUI | KMOD_RGUI)
        }

        #endregion

        #region SDL_keyboard.h

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_Keysym
        {
            public SDL_Scancode scancode;
            public SDL_Keycode sym;
            public SDL_Keymod mod; /* UInt16 */
            public UInt32 unicode; /* Deprecated */
        }

        /* Get the window which has kbd focus */
        /* Return type is an SDL_Window pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetKeyboardFocus();

        /* Get a snapshot of the keyboard state. */
        /* Return value is a pointer to a UInt8 array */
        /* Numkeys returns the size of the array if non-null */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetKeyboardState(out int numkeys);

        /* Get the current key modifier state for the keyboard. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_Keymod SDL_GetModState();

        /* Set the current key modifier state */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetModState(SDL_Keymod modstate);

        /* Get the key code corresponding to the given scancode
		 * with the current keyboard layout.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_Keycode SDL_GetKeyFromScancode(SDL_Scancode scancode);

        /* Get the scancode for the given keycode */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_Scancode SDL_GetScancodeFromKey(SDL_Keycode key);

        /* Wrapper for SDL_GetScancodeName */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetScancodeName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetScancodeName(SDL_Scancode scancode);
        public static string SDL_GetScancodeName(SDL_Scancode scancode)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetScancodeName(scancode)
            );
        }

        /* Get a scancode from a human-readable name */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetScancodeFromName", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_Scancode INTERNAL_SDL_GetScancodeFromName(
            byte[] name
        );
        public static SDL_Scancode SDL_GetScancodeFromName(string name)
        {
            return INTERNAL_SDL_GetScancodeFromName(
                UTF8_ToNative(name)
            );
        }

        /* Wrapper for SDL_GetKeyName */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetKeyName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetKeyName(SDL_Keycode key);
        public static string SDL_GetKeyName(SDL_Keycode key)
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetKeyName(key));
        }

        /* Get a key code from a human-readable name */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetKeyFromName", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_Keycode INTERNAL_SDL_GetKeyFromName(
            byte[] name
        );
        public static SDL_Keycode SDL_GetKeyFromName(string name)
        {
            return INTERNAL_SDL_GetKeyFromName(UTF8_ToNative(name));
        }

        /* Start accepting Unicode text input events, show keyboard */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_StartTextInput();

        /* Check if unicode input events are enabled */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsTextInputActive();

        /* Stop receiving any text input events, hide onscreen kbd */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_StopTextInput();

        /* Set the rectangle used for text input, hint for IME */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetTextInputRect(ref SDL_Rect rect);

        /* Does the platform support an on-screen keyboard? */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasScreenKeyboardSupport();

        /* Is the on-screen keyboard shown for a given window? */
        /* window is an SDL_Window pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsScreenKeyboardShown(IntPtr window);

        #endregion

        #region SDL_mouse.c

        /* Note: SDL_Cursor is a typedef normally. We'll treat it as
		 * an IntPtr, because C# doesn't do typedefs. Yay!
		 */

        /* System cursor types */
        public enum SDL_SystemCursor
        {
            SDL_SYSTEM_CURSOR_ARROW,    // Arrow
            SDL_SYSTEM_CURSOR_IBEAM,    // I-beam
            SDL_SYSTEM_CURSOR_WAIT,     // Wait
            SDL_SYSTEM_CURSOR_CROSSHAIR,    // Crosshair
            SDL_SYSTEM_CURSOR_WAITARROW,    // Small wait cursor (or Wait if not available)
            SDL_SYSTEM_CURSOR_SIZENWSE, // Double arrow pointing northwest and southeast
            SDL_SYSTEM_CURSOR_SIZENESW, // Double arrow pointing northeast and southwest
            SDL_SYSTEM_CURSOR_SIZEWE,   // Double arrow pointing west and east
            SDL_SYSTEM_CURSOR_SIZENS,   // Double arrow pointing north and south
            SDL_SYSTEM_CURSOR_SIZEALL,  // Four pointed arrow pointing north, south, east, and west
            SDL_SYSTEM_CURSOR_NO,       // Slashed circle or crossbones
            SDL_SYSTEM_CURSOR_HAND,     // Hand
            SDL_NUM_SYSTEM_CURSORS
        }

        /* Get the window which currently has mouse focus */
        /* Return value is an SDL_Window pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetMouseFocus();

        /* Get the current state of the mouse */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetMouseState(out int x, out int y);

        /* Get the current state of the mouse */
        /* This overload allows for passing NULL to x */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetMouseState(IntPtr x, out int y);

        /* Get the current state of the mouse */
        /* This overload allows for passing NULL to y */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetMouseState(out int x, IntPtr y);

        /* Get the current state of the mouse */
        /* This overload allows for passing NULL to both x and y */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetMouseState(IntPtr x, IntPtr y);

        /* Get the current state of the mouse, in relation to the desktop */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetGlobalMouseState(out int x, out int y);

        /* Get the current state of the mouse, in relation to the desktop */
        /* Only available in 2.0.4 */
        /* This overload allows for passing NULL to x */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetGlobalMouseState(IntPtr x, out int y);

        /* Get the current state of the mouse, in relation to the desktop */
        /* Only available in 2.0.4 */
        /* This overload allows for passing NULL to y */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetGlobalMouseState(out int x, IntPtr y);

        /* Get the current state of the mouse, in relation to the desktop */
        /* Only available in 2.0.4 */
        /* This overload allows for passing NULL to both x and y */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetGlobalMouseState(IntPtr x, IntPtr y);

        /* Get the mouse state with relative coords*/
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetRelativeMouseState(out int x, out int y);

        /* Set the mouse cursor's position (within a window) */
        /* window is an SDL_Window pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_WarpMouseInWindow(IntPtr window, int x, int y);

        /* Set the mouse cursor's position in global screen space */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_WarpMouseGlobal(int x, int y);

        /* Enable/Disable relative mouse mode (grabs mouse, rel coords) */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SetRelativeMouseMode(SDL_bool enabled);

        /* Capture the mouse, to track input outside an SDL window */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_CaptureMouse(SDL_bool enabled);

        /* Query if the relative mouse mode is enabled */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_GetRelativeMouseMode();

        /* Create a cursor from bitmap data (amd mask) in MSB format */
        /* data and mask are byte arrays, and w must be a multiple of 8 */
        /* return value is an SDL_Cursor pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateCursor(
            IntPtr data,
            IntPtr mask,
            int w,
            int h,
            int hot_x,
            int hot_y
        );

        /* Create a cursor from an SDL_Surface */
        /* IntPtr refers to an SDL_Cursor*, surface to an SDL_Surface* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateColorCursor(
            IntPtr surface,
            int hot_x,
            int hot_y
        );

        /* Create a cursor from a system cursor id */
        /* return value is an SDL_Cursor pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_CreateSystemCursor(SDL_SystemCursor id);

        /* Set the active cursor */
        /* cursor is an SDL_Cursor pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetCursor(IntPtr cursor);

        /* Return the active cursor */
        /* return value is an SDL_Cursor pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetCursor();

        /* Frees a cursor created with one of the CreateCursor functions */
        /* cursor in an SDL_Cursor pointer */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeCursor(IntPtr cursor);

        /* Toggle whether or not the cursor is shown */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_ShowCursor(int toggle);

        public static uint SDL_BUTTON(uint X)
        {
            // If only there were a better way of doing this in C#
            return (uint)(1 << ((int)X - 1));
        }

        public const uint SDL_BUTTON_LEFT = 1;
        public const uint SDL_BUTTON_MIDDLE = 2;
        public const uint SDL_BUTTON_RIGHT = 3;
        public const uint SDL_BUTTON_X1 = 4;
        public const uint SDL_BUTTON_X2 = 5;
        public static readonly UInt32 SDL_BUTTON_LMASK = SDL_BUTTON(SDL_BUTTON_LEFT);
        public static readonly UInt32 SDL_BUTTON_MMASK = SDL_BUTTON(SDL_BUTTON_MIDDLE);
        public static readonly UInt32 SDL_BUTTON_RMASK = SDL_BUTTON(SDL_BUTTON_RIGHT);
        public static readonly UInt32 SDL_BUTTON_X1MASK = SDL_BUTTON(SDL_BUTTON_X1);
        public static readonly UInt32 SDL_BUTTON_X2MASK = SDL_BUTTON(SDL_BUTTON_X2);

        #endregion

        #region SDL_touch.h

        public const uint SDL_TOUCH_MOUSEID = uint.MaxValue;

        public struct SDL_Finger
        {
            public long id; // SDL_FingerID
            public float x;
            public float y;
            public float pressure;
        }

        /* Only available in SDL 2.0.10 or higher. */
        public enum SDL_TouchDeviceType
        {
            SDL_TOUCH_DEVICE_INVALID = -1,
            SDL_TOUCH_DEVICE_DIRECT,            /* touch screen with window-relative coordinates */
            SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /* trackpad with absolute device coordinates */
            SDL_TOUCH_DEVICE_INDIRECT_RELATIVE  /* trackpad with screen cursor-relative coordinates */
        }

        /**
		 *  \brief Get the number of registered touch devices.
 		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumTouchDevices();

        /**
		 *  \brief Get the touch ID with the given index, or 0 if the index is invalid.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern long SDL_GetTouchDevice(int index);

        /**
		 *  \brief Get the number of active fingers for a given touch device.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumTouchFingers(long touchID);

        /**
		 *  \brief Get the finger object of the given touch, with the given index.
		 *  Returns pointer to SDL_Finger.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GetTouchFinger(long touchID, int index);

        /* Only available in SDL 2.0.10 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_TouchDeviceType SDL_GetTouchDeviceType(Int64 touchID);

        #endregion

        #region SDL_joystick.h

        public const byte SDL_HAT_CENTERED = 0x00;
        public const byte SDL_HAT_UP = 0x01;
        public const byte SDL_HAT_RIGHT = 0x02;
        public const byte SDL_HAT_DOWN = 0x04;
        public const byte SDL_HAT_LEFT = 0x08;
        public const byte SDL_HAT_RIGHTUP = SDL_HAT_RIGHT | SDL_HAT_UP;
        public const byte SDL_HAT_RIGHTDOWN = SDL_HAT_RIGHT | SDL_HAT_DOWN;
        public const byte SDL_HAT_LEFTUP = SDL_HAT_LEFT | SDL_HAT_UP;
        public const byte SDL_HAT_LEFTDOWN = SDL_HAT_LEFT | SDL_HAT_DOWN;

        public enum SDL_JoystickPowerLevel
        {
            SDL_JOYSTICK_POWER_UNKNOWN = -1,
            SDL_JOYSTICK_POWER_EMPTY,
            SDL_JOYSTICK_POWER_LOW,
            SDL_JOYSTICK_POWER_MEDIUM,
            SDL_JOYSTICK_POWER_FULL,
            SDL_JOYSTICK_POWER_WIRED,
            SDL_JOYSTICK_POWER_MAX
        }

        public enum SDL_JoystickType
        {
            SDL_JOYSTICK_TYPE_UNKNOWN,
            SDL_JOYSTICK_TYPE_GAMECONTROLLER,
            SDL_JOYSTICK_TYPE_WHEEL,
            SDL_JOYSTICK_TYPE_ARCADE_STICK,
            SDL_JOYSTICK_TYPE_FLIGHT_STICK,
            SDL_JOYSTICK_TYPE_DANCE_PAD,
            SDL_JOYSTICK_TYPE_GUITAR,
            SDL_JOYSTICK_TYPE_DRUM_KIT,
            SDL_JOYSTICK_TYPE_ARCADE_PAD
        }

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.9 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickRumble(
            IntPtr joystick,
            UInt16 low_frequency_rumble,
            UInt16 high_frequency_rumble,
            UInt32 duration_ms
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_JoystickClose(IntPtr joystick);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickEventState(int state);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern short SDL_JoystickGetAxis(
            IntPtr joystick,
            int axis
        );

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_JoystickGetAxisInitialState(
            IntPtr joystick,
            int axis,
            out ushort state
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickGetBall(
            IntPtr joystick,
            int ball,
            out int dx,
            out int dy
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern byte SDL_JoystickGetButton(
            IntPtr joystick,
            int button
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern byte SDL_JoystickGetHat(
            IntPtr joystick,
            int hat
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, EntryPoint = "SDL_JoystickName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_JoystickName(
            IntPtr joystick
        );
        public static string SDL_JoystickName(IntPtr joystick)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_JoystickName(joystick)
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_JoystickNameForIndex", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_JoystickNameForIndex(
            int device_index
        );
        public static string SDL_JoystickNameForIndex(int device_index)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_JoystickNameForIndex(device_index)
            );
        }

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickNumAxes(IntPtr joystick);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickNumBalls(IntPtr joystick);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickNumButtons(IntPtr joystick);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickNumHats(IntPtr joystick);

        /* IntPtr refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_JoystickOpen(int device_index);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_JoystickUpdate();

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_NumJoysticks();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern Guid SDL_JoystickGetDeviceGUID(
            int device_index
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern Guid SDL_JoystickGetGUID(
            IntPtr joystick
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_JoystickGetGUIDString(
            Guid guid,
            byte[] pszGUID,
            int cbGUID
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_JoystickGetGUIDFromString", CallingConvention = CallingConvention.Cdecl)]
        private static extern Guid INTERNAL_SDL_JoystickGetGUIDFromString(
            byte[] pchGUID
        );
        public static Guid SDL_JoystickGetGUIDFromString(string pchGuid)
        {
            return INTERNAL_SDL_JoystickGetGUIDFromString(
                UTF8_ToNative(pchGuid)
            );
        }

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetDeviceVendor(int device_index);

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetDeviceProduct(int device_index);

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetDeviceProductVersion(int device_index);

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_JoystickType SDL_JoystickGetDeviceType(int device_index);

        /* int refers to an SDL_JoystickID.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickGetDeviceInstanceID(int device_index);

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetVendor(IntPtr joystick);

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetProduct(IntPtr joystick);

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_JoystickGetProductVersion(IntPtr joystick);

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_JoystickType SDL_JoystickGetType(IntPtr joystick);

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_JoystickGetAttached(IntPtr joystick);

        /* int refers to an SDL_JoystickID, joystick to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickInstanceID(IntPtr joystick);

        /* joystick refers to an SDL_Joystick*.
		 * This function is only available in 2.0.4 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_JoystickPowerLevel SDL_JoystickCurrentPowerLevel(
            IntPtr joystick
        );

        /* int refers to an SDL_JoystickID, IntPtr to an SDL_Joystick*.
		 * This function is only available in 2.0.4 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_JoystickFromInstanceID(int joyid);

        /* Only available in 2.0.7 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LockJoysticks();

        /* Only available in 2.0.7 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnlockJoysticks();

        #endregion

        #region SDL_gamecontroller.h

        public enum SDL_GameControllerBindType
        {
            SDL_CONTROLLER_BINDTYPE_NONE,
            SDL_CONTROLLER_BINDTYPE_BUTTON,
            SDL_CONTROLLER_BINDTYPE_AXIS,
            SDL_CONTROLLER_BINDTYPE_HAT
        }

        public enum SDL_GameControllerAxis
        {
            SDL_CONTROLLER_AXIS_INVALID = -1,
            SDL_CONTROLLER_AXIS_LEFTX,
            SDL_CONTROLLER_AXIS_LEFTY,
            SDL_CONTROLLER_AXIS_RIGHTX,
            SDL_CONTROLLER_AXIS_RIGHTY,
            SDL_CONTROLLER_AXIS_TRIGGERLEFT,
            SDL_CONTROLLER_AXIS_TRIGGERRIGHT,
            SDL_CONTROLLER_AXIS_MAX
        }

        public enum SDL_GameControllerButton
        {
            SDL_CONTROLLER_BUTTON_INVALID = -1,
            SDL_CONTROLLER_BUTTON_A,
            SDL_CONTROLLER_BUTTON_B,
            SDL_CONTROLLER_BUTTON_X,
            SDL_CONTROLLER_BUTTON_Y,
            SDL_CONTROLLER_BUTTON_BACK,
            SDL_CONTROLLER_BUTTON_GUIDE,
            SDL_CONTROLLER_BUTTON_START,
            SDL_CONTROLLER_BUTTON_LEFTSTICK,
            SDL_CONTROLLER_BUTTON_RIGHTSTICK,
            SDL_CONTROLLER_BUTTON_LEFTSHOULDER,
            SDL_CONTROLLER_BUTTON_RIGHTSHOULDER,
            SDL_CONTROLLER_BUTTON_DPAD_UP,
            SDL_CONTROLLER_BUTTON_DPAD_DOWN,
            SDL_CONTROLLER_BUTTON_DPAD_LEFT,
            SDL_CONTROLLER_BUTTON_DPAD_RIGHT,
            SDL_CONTROLLER_BUTTON_MAX,
        }

        // FIXME: I'd rather this somehow be private...
        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_GameControllerButtonBind_hat
        {
            public int hat;
            public int hat_mask;
        }

        // FIXME: I'd rather this somehow be private...
        [StructLayout(LayoutKind.Explicit)]
        public struct INTERNAL_GameControllerButtonBind_union
        {
            [FieldOffset(0)]
            public int button;
            [FieldOffset(0)]
            public int axis;
            [FieldOffset(0)]
            public INTERNAL_GameControllerButtonBind_hat hat;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_GameControllerButtonBind
        {
            public SDL_GameControllerBindType bindType;
            public INTERNAL_GameControllerButtonBind_union value;
        }

        /* This exists to deal with C# being stupid about blittable types. */
        [StructLayout(LayoutKind.Sequential)]
        private struct INTERNAL_SDL_GameControllerButtonBind
        {
            public int bindType;
            /* Largest data type in the union is two ints in size */
            public int unionVal0;
            public int unionVal1;
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerAddMapping", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_GameControllerAddMapping(
            byte[] mappingString
        );
        public static int SDL_GameControllerAddMapping(
            string mappingString
        )
        {
            return INTERNAL_SDL_GameControllerAddMapping(
                UTF8_ToNative(mappingString)
            );
        }

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GameControllerNumMappings();

        /* This function is only available in 2.0.6 or higher. */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerMappingForIndex", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerMappingForIndex(int mapping_index);
        public static string SDL_GameControllerMappingForIndex(int mapping_index)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerMappingForIndex(
                    mapping_index
                )
            );
        }

        /* THIS IS AN RWops FUNCTION! */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerAddMappingsFromRW", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_GameControllerAddMappingsFromRW(
            IntPtr rw,
            int freerw
        );
        public static int SDL_GameControllerAddMappingsFromFile(string file)
        {
            IntPtr rwops = SDL_RWFromFile(file, "rb");
            return INTERNAL_SDL_GameControllerAddMappingsFromRW(rwops, 1);
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerMappingForGUID", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerMappingForGUID(
            Guid guid
        );
        public static string SDL_GameControllerMappingForGUID(Guid guid)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerMappingForGUID(guid)
            );
        }

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerMapping", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerMapping(
            IntPtr gamecontroller
        );
        public static string SDL_GameControllerMapping(
            IntPtr gamecontroller
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerMapping(
                    gamecontroller
                )
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsGameController(int joystick_index);

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerNameForIndex", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerNameForIndex(
            int joystick_index
        );
        public static string SDL_GameControllerNameForIndex(
            int joystick_index
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerNameForIndex(joystick_index)
            );
        }

        /* Only available in 2.0.9 or higher */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerMappingForDeviceIndex", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerMappingForDeviceIndex(
            int joystick_index
        );
        public static string SDL_GameControllerMappingForDeviceIndex(
            int joystick_index
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerMappingForDeviceIndex(joystick_index)
            );
        }

        /* IntPtr refers to an SDL_GameController* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GameControllerOpen(int joystick_index);

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerName(
            IntPtr gamecontroller
        );
        public static string SDL_GameControllerName(
            IntPtr gamecontroller
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerName(gamecontroller)
            );
        }

        /* gamecontroller refers to an SDL_GameController*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_GameControllerGetVendor(
            IntPtr gamecontroller
        );

        /* gamecontroller refers to an SDL_GameController*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_GameControllerGetProduct(
            IntPtr gamecontroller
        );

        /* gamecontroller refers to an SDL_GameController*.
		 * This function is only available in 2.0.6 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern ushort SDL_GameControllerGetProductVersion(
            IntPtr gamecontroller
        );

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_GameControllerGetAttached(
            IntPtr gamecontroller
        );

        /* IntPtr refers to an SDL_Joystick*
		 * gamecontroller refers to an SDL_GameController*
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GameControllerGetJoystick(
            IntPtr gamecontroller
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GameControllerEventState(int state);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GameControllerUpdate();

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetAxisFromString", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_GameControllerAxis INTERNAL_SDL_GameControllerGetAxisFromString(
            byte[] pchString
        );
        public static SDL_GameControllerAxis SDL_GameControllerGetAxisFromString(
            string pchString
        )
        {
            return INTERNAL_SDL_GameControllerGetAxisFromString(
                UTF8_ToNative(pchString)
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetStringForAxis", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerGetStringForAxis(
            SDL_GameControllerAxis axis
        );
        public static string SDL_GameControllerGetStringForAxis(
            SDL_GameControllerAxis axis
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerGetStringForAxis(
                    axis
                )
            );
        }

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetBindForAxis", CallingConvention = CallingConvention.Cdecl)]
        private static extern INTERNAL_SDL_GameControllerButtonBind INTERNAL_SDL_GameControllerGetBindForAxis(
            IntPtr gamecontroller,
            SDL_GameControllerAxis axis
        );
        public static SDL_GameControllerButtonBind SDL_GameControllerGetBindForAxis(
            IntPtr gamecontroller,
            SDL_GameControllerAxis axis
        )
        {
            // This is guaranteed to never be null
            INTERNAL_SDL_GameControllerButtonBind dumb = INTERNAL_SDL_GameControllerGetBindForAxis(
                gamecontroller,
                axis
            );
            SDL_GameControllerButtonBind result = new SDL_GameControllerButtonBind();
            result.bindType = (SDL_GameControllerBindType)dumb.bindType;
            result.value.hat.hat = dumb.unionVal0;
            result.value.hat.hat_mask = dumb.unionVal1;
            return result;
        }

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern short SDL_GameControllerGetAxis(
            IntPtr gamecontroller,
            SDL_GameControllerAxis axis
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetButtonFromString", CallingConvention = CallingConvention.Cdecl)]
        private static extern SDL_GameControllerButton INTERNAL_SDL_GameControllerGetButtonFromString(
            byte[] pchString
        );
        public static SDL_GameControllerButton SDL_GameControllerGetButtonFromString(
            string pchString
        )
        {
            return INTERNAL_SDL_GameControllerGetButtonFromString(
                UTF8_ToNative(pchString)
            );
        }

        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetStringForButton", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GameControllerGetStringForButton(
            SDL_GameControllerButton button
        );
        public static string SDL_GameControllerGetStringForButton(
            SDL_GameControllerButton button
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GameControllerGetStringForButton(button)
            );
        }

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, EntryPoint = "SDL_GameControllerGetBindForButton", CallingConvention = CallingConvention.Cdecl)]
        private static extern INTERNAL_SDL_GameControllerButtonBind INTERNAL_SDL_GameControllerGetBindForButton(
            IntPtr gamecontroller,
            SDL_GameControllerButton button
        );
        public static SDL_GameControllerButtonBind SDL_GameControllerGetBindForButton(
            IntPtr gamecontroller,
            SDL_GameControllerButton button
        )
        {
            // This is guaranteed to never be null
            INTERNAL_SDL_GameControllerButtonBind dumb = INTERNAL_SDL_GameControllerGetBindForButton(
                gamecontroller,
                button
            );
            SDL_GameControllerButtonBind result = new SDL_GameControllerButtonBind();
            result.bindType = (SDL_GameControllerBindType)dumb.bindType;
            result.value.hat.hat = dumb.unionVal0;
            result.value.hat.hat_mask = dumb.unionVal1;
            return result;
        }

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern byte SDL_GameControllerGetButton(
            IntPtr gamecontroller,
            SDL_GameControllerButton button
        );

        /* gamecontroller refers to an SDL_GameController*.
		 * This function is only available in 2.0.9 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GameControllerRumble(
            IntPtr gamecontroller,
            UInt16 low_frequency_rumble,
            UInt16 high_frequency_rumble,
            UInt32 duration_ms
        );

        /* gamecontroller refers to an SDL_GameController* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_GameControllerClose(
            IntPtr gamecontroller
        );

        /* int refers to an SDL_JoystickID, IntPtr to an SDL_GameController*.
		 * This function is only available in 2.0.4 or higher.
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_GameControllerFromInstanceID(int joyid);

        #endregion

        #region SDL_haptic.h

        /* SDL_HapticEffect type */
        public const ushort SDL_HAPTIC_CONSTANT = (1 << 0);
        public const ushort SDL_HAPTIC_SINE = (1 << 1);
        public const ushort SDL_HAPTIC_LEFTRIGHT = (1 << 2);
        public const ushort SDL_HAPTIC_TRIANGLE = (1 << 3);
        public const ushort SDL_HAPTIC_SAWTOOTHUP = (1 << 4);
        public const ushort SDL_HAPTIC_SAWTOOTHDOWN = (1 << 5);
        public const ushort SDL_HAPTIC_SPRING = (1 << 7);
        public const ushort SDL_HAPTIC_DAMPER = (1 << 8);
        public const ushort SDL_HAPTIC_INERTIA = (1 << 9);
        public const ushort SDL_HAPTIC_FRICTION = (1 << 10);
        public const ushort SDL_HAPTIC_CUSTOM = (1 << 11);
        public const ushort SDL_HAPTIC_GAIN = (1 << 12);
        public const ushort SDL_HAPTIC_AUTOCENTER = (1 << 13);
        public const ushort SDL_HAPTIC_STATUS = (1 << 14);
        public const ushort SDL_HAPTIC_PAUSE = (1 << 15);

        /* SDL_HapticDirection type */
        public const byte SDL_HAPTIC_POLAR = 0;
        public const byte SDL_HAPTIC_CARTESIAN = 1;
        public const byte SDL_HAPTIC_SPHERICAL = 2;

        /* SDL_HapticRunEffect */
        public const uint SDL_HAPTIC_INFINITY = 4294967295U;

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_HapticDirection
        {
            public byte type;
            public fixed int dir[3];
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_HapticConstant
        {
            // Header
            public ushort type;
            public SDL_HapticDirection direction;
            // Replay
            public uint length;
            public ushort delay;
            // Trigger
            public ushort button;
            public ushort interval;
            // Constant
            public short level;
            // Envelope
            public ushort attack_length;
            public ushort attack_level;
            public ushort fade_length;
            public ushort fade_level;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_HapticPeriodic
        {
            // Header
            public ushort type;
            public SDL_HapticDirection direction;
            // Replay
            public uint length;
            public ushort delay;
            // Trigger
            public ushort button;
            public ushort interval;
            // Periodic
            public ushort period;
            public short magnitude;
            public short offset;
            public ushort phase;
            // Envelope
            public ushort attack_length;
            public ushort attack_level;
            public ushort fade_length;
            public ushort fade_level;
        }

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct SDL_HapticCondition
        {
            // Header
            public ushort type;
            public SDL_HapticDirection direction;
            // Replay
            public uint length;
            public ushort delay;
            // Trigger
            public ushort button;
            public ushort interval;
            // Condition
            public fixed ushort right_sat[3];
            public fixed ushort left_sat[3];
            public fixed short right_coeff[3];
            public fixed short left_coeff[3];
            public fixed ushort deadband[3];
            public fixed short center[3];
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_HapticRamp
        {
            // Header
            public ushort type;
            public SDL_HapticDirection direction;
            // Replay
            public uint length;
            public ushort delay;
            // Trigger
            public ushort button;
            public ushort interval;
            // Ramp
            public short start;
            public short end;
            // Envelope
            public ushort attack_length;
            public ushort attack_level;
            public ushort fade_length;
            public ushort fade_level;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_HapticLeftRight
        {
            // Header
            public ushort type;
            // Replay
            public uint length;
            // Rumble
            public ushort large_magnitude;
            public ushort small_magnitude;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_HapticCustom
        {
            // Header
            public ushort type;
            public SDL_HapticDirection direction;
            // Replay
            public uint length;
            public ushort delay;
            // Trigger
            public ushort button;
            public ushort interval;
            // Custom
            public byte channels;
            public ushort period;
            public ushort samples;
            public IntPtr data; // Uint16*
                                // Envelope
            public ushort attack_length;
            public ushort attack_level;
            public ushort fade_length;
            public ushort fade_level;
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct SDL_HapticEffect
        {
            [FieldOffset(0)]
            public ushort type;
            [FieldOffset(0)]
            public SDL_HapticConstant constant;
            [FieldOffset(0)]
            public SDL_HapticPeriodic periodic;
            [FieldOffset(0)]
            public SDL_HapticCondition condition;
            [FieldOffset(0)]
            public SDL_HapticRamp ramp;
            [FieldOffset(0)]
            public SDL_HapticLeftRight leftright;
            [FieldOffset(0)]
            public SDL_HapticCustom custom;
        }

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_HapticClose(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_HapticDestroyEffect(
            IntPtr haptic,
            int effect
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticEffectSupported(
            IntPtr haptic,
            ref SDL_HapticEffect effect
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticGetEffectStatus(
            IntPtr haptic,
            int effect
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticIndex(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, EntryPoint = "SDL_HapticName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_HapticName(int device_index);
        public static string SDL_HapticName(int device_index)
        {
            return UTF8_ToManaged(INTERNAL_SDL_HapticName(device_index));
        }

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticNewEffect(
            IntPtr haptic,
            ref SDL_HapticEffect effect
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticNumAxes(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticNumEffects(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticNumEffectsPlaying(IntPtr haptic);

        /* IntPtr refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_HapticOpen(int device_index);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticOpened(int device_index);

        /* IntPtr refers to an SDL_Haptic*, joystick to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_HapticOpenFromJoystick(
            IntPtr joystick
        );

        /* IntPtr refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_HapticOpenFromMouse();

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticPause(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_HapticQuery(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticRumbleInit(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticRumblePlay(
            IntPtr haptic,
            float strength,
            uint length
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticRumbleStop(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticRumbleSupported(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticRunEffect(
            IntPtr haptic,
            int effect,
            uint iterations
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticSetAutocenter(
            IntPtr haptic,
            int autocenter
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticSetGain(
            IntPtr haptic,
            int gain
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticStopAll(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticStopEffect(
            IntPtr haptic,
            int effect
        );

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticUnpause(IntPtr haptic);

        /* haptic refers to an SDL_Haptic* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_HapticUpdateEffect(
            IntPtr haptic,
            int effect,
            ref SDL_HapticEffect data
        );

        /* joystick refers to an SDL_Joystick* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_JoystickIsHaptic(IntPtr joystick);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_MouseIsHaptic();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_NumHaptics();

        #endregion

        #region SDL_sensor.h

        /* This region is only available in 2.0.9 or higher. */

        public enum SDL_SensorType
        {
            SDL_SENSOR_INVALID = -1,
            SDL_SENSOR_UNKNOWN,
            SDL_SENSOR_ACCEL,
            SDL_SENSOR_GYRO
        }

        public const float SDL_STANDARD_GRAVITY = 9.80665f;

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_NumSensors();

        [DllImport(nativeLibName, EntryPoint = "SDL_SensorGetDeviceName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_SensorGetDeviceName(int device_index);
        public static string SDL_SensorGetDeviceName(int device_index)
        {
            return UTF8_ToManaged(INTERNAL_SDL_SensorGetDeviceName(device_index));
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_SensorType SDL_SensorGetDeviceType(int device_index);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SensorGetDeviceNonPortableType(int device_index);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern Int32 SDL_SensorGetDeviceInstanceID(int device_index);

        /* IntPtr refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_SensorOpen(int device_index);

        /* IntPtr refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_SensorFromInstanceID(
            Int32 instance_id
        );

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, EntryPoint = "SDL_SensorGetName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_SensorGetName(IntPtr sensor);
        public static string SDL_SensorGetName(IntPtr sensor)
        {
            return UTF8_ToManaged(INTERNAL_SDL_SensorGetName(sensor));
        }

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_SensorType SDL_SensorGetType(IntPtr sensor);

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SensorGetNonPortableType(IntPtr sensor);

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern Int32 SDL_SensorGetInstanceID(IntPtr sensor);

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_SensorGetData(
            IntPtr sensor,
            float[] data,
            int num_values
        );

        /* sensor refers to an SDL_Sensor* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SensorClose(IntPtr sensor);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SensorUpdate();

        #endregion

        #region SDL_audio.h

        public const ushort SDL_AUDIO_MASK_BITSIZE = 0xFF;
        public const ushort SDL_AUDIO_MASK_DATATYPE = (1 << 8);
        public const ushort SDL_AUDIO_MASK_ENDIAN = (1 << 12);
        public const ushort SDL_AUDIO_MASK_SIGNED = (1 << 15);

        public static ushort SDL_AUDIO_BITSIZE(ushort x)
        {
            return (ushort)(x & SDL_AUDIO_MASK_BITSIZE);
        }

        public static bool SDL_AUDIO_ISFLOAT(ushort x)
        {
            return (x & SDL_AUDIO_MASK_DATATYPE) != 0;
        }

        public static bool SDL_AUDIO_ISBIGENDIAN(ushort x)
        {
            return (x & SDL_AUDIO_MASK_ENDIAN) != 0;
        }

        public static bool SDL_AUDIO_ISSIGNED(ushort x)
        {
            return (x & SDL_AUDIO_MASK_SIGNED) != 0;
        }

        public static bool SDL_AUDIO_ISINT(ushort x)
        {
            return (x & SDL_AUDIO_MASK_DATATYPE) == 0;
        }

        public static bool SDL_AUDIO_ISLITTLEENDIAN(ushort x)
        {
            return (x & SDL_AUDIO_MASK_ENDIAN) == 0;
        }

        public static bool SDL_AUDIO_ISUNSIGNED(ushort x)
        {
            return (x & SDL_AUDIO_MASK_SIGNED) == 0;
        }

        public const ushort AUDIO_U8 = 0x0008;
        public const ushort AUDIO_S8 = 0x8008;
        public const ushort AUDIO_U16LSB = 0x0010;
        public const ushort AUDIO_S16LSB = 0x8010;
        public const ushort AUDIO_U16MSB = 0x1010;
        public const ushort AUDIO_S16MSB = 0x9010;
        public const ushort AUDIO_U16 = AUDIO_U16LSB;
        public const ushort AUDIO_S16 = AUDIO_S16LSB;
        public const ushort AUDIO_S32LSB = 0x8020;
        public const ushort AUDIO_S32MSB = 0x9020;
        public const ushort AUDIO_S32 = AUDIO_S32LSB;
        public const ushort AUDIO_F32LSB = 0x8120;
        public const ushort AUDIO_F32MSB = 0x9120;
        public const ushort AUDIO_F32 = AUDIO_F32LSB;

        public static readonly ushort AUDIO_U16SYS =
            BitConverter.IsLittleEndian ? AUDIO_U16LSB : AUDIO_U16MSB;
        public static readonly ushort AUDIO_S16SYS =
            BitConverter.IsLittleEndian ? AUDIO_S16LSB : AUDIO_S16MSB;
        public static readonly ushort AUDIO_S32SYS =
            BitConverter.IsLittleEndian ? AUDIO_S32LSB : AUDIO_S32MSB;
        public static readonly ushort AUDIO_F32SYS =
            BitConverter.IsLittleEndian ? AUDIO_F32LSB : AUDIO_F32MSB;

        public const uint SDL_AUDIO_ALLOW_FREQUENCY_CHANGE = 0x00000001;
        public const uint SDL_AUDIO_ALLOW_FORMAT_CHANGE = 0x00000002;
        public const uint SDL_AUDIO_ALLOW_CHANNELS_CHANGE = 0x00000004;
        public const uint SDL_AUDIO_ALLOW_SAMPLES_CHANGE = 0x00000008;
        public const uint SDL_AUDIO_ALLOW_ANY_CHANGE = (
            SDL_AUDIO_ALLOW_FREQUENCY_CHANGE |
            SDL_AUDIO_ALLOW_FORMAT_CHANGE |
            SDL_AUDIO_ALLOW_CHANNELS_CHANGE |
            SDL_AUDIO_ALLOW_SAMPLES_CHANGE
        );

        public const int SDL_MIX_MAXVOLUME = 128;

        public enum SDL_AudioStatus
        {
            SDL_AUDIO_STOPPED,
            SDL_AUDIO_PLAYING,
            SDL_AUDIO_PAUSED
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_AudioSpec
        {
            public int freq;
            public ushort format; // SDL_AudioFormat
            public byte channels;
            public byte silence;
            public ushort samples;
            public uint size;
            public SDL_AudioCallback callback;
            public IntPtr userdata; // void*
        }

        /* userdata refers to a void*, stream to a Uint8 */
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate void SDL_AudioCallback(
            IntPtr userdata,
            IntPtr stream,
            int len
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_AudioInit", CallingConvention = CallingConvention.Cdecl)]
        private static extern int INTERNAL_SDL_AudioInit(
            byte[] driver_name
        );
        public static int SDL_AudioInit(string driver_name)
        {
            return INTERNAL_SDL_AudioInit(
                UTF8_ToNative(driver_name)
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_AudioQuit();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_CloseAudio();

        /* dev refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_CloseAudioDevice(uint dev);

        /* audio_buf refers to a malloc()'d buffer from SDL_LoadWAV */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeWAV(IntPtr audio_buf);

        [DllImport(nativeLibName, EntryPoint = "SDL_GetAudioDeviceName", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetAudioDeviceName(
            int index,
            int iscapture
        );
        public static string SDL_GetAudioDeviceName(
            int index,
            int iscapture
        )
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetAudioDeviceName(index, iscapture)
            );
        }

        /* dev refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_AudioStatus SDL_GetAudioDeviceStatus(
            uint dev
        );

        [DllImport(nativeLibName, EntryPoint = "SDL_GetAudioDriver", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetAudioDriver(int index);
        public static string SDL_GetAudioDriver(int index)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetAudioDriver(index)
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_AudioStatus SDL_GetAudioStatus();

        [DllImport(nativeLibName, EntryPoint = "SDL_GetCurrentAudioDriver", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetCurrentAudioDriver();
        public static string SDL_GetCurrentAudioDriver()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetCurrentAudioDriver());
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumAudioDevices(int iscapture);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetNumAudioDrivers();

        /* audio_buf will refer to a malloc()'d byte buffer */
        /* THIS IS AN RWops FUNCTION! */
        [DllImport(nativeLibName, EntryPoint = "SDL_LoadWAV_RW", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_LoadWAV_RW(
            IntPtr src,
            int freesrc,
            ref SDL_AudioSpec spec,
            out IntPtr audio_buf,
            out uint audio_len
        );
        public static SDL_AudioSpec SDL_LoadWAV(
            string file,
            ref SDL_AudioSpec spec,
            out IntPtr audio_buf,
            out uint audio_len
        )
        {
            SDL_AudioSpec result;
            IntPtr rwops = SDL_RWFromFile(file, "rb");
            IntPtr result_ptr = INTERNAL_SDL_LoadWAV_RW(
                rwops,
                1,
                ref spec,
                out audio_buf,
                out audio_len
            );
            result = (SDL_AudioSpec)Marshal.PtrToStructure(
                result_ptr,
                typeof(SDL_AudioSpec)
            );
            return result;
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LockAudio();

        /* dev refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_LockAudioDevice(uint dev);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MixAudio(
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1, SizeParamIndex = 2)]
                byte[] dst,
            [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1, SizeParamIndex = 2)]
                byte[] src,
            uint len,
            int volume
        );
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MixAudio(IntPtr dst, IntPtr src, uint len, int volume);
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MixAudio(IntPtr dst,
                [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1, SizeParamIndex = 2)]
                float[] src,
                uint len,
                int volume
            );
        /* format refers to an SDL_AudioFormat */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_MixAudioFormat(
            [Out()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1, SizeParamIndex = 3)]
                byte[] dst,
            [In()] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1, SizeParamIndex = 3)]
                byte[] src,
            ushort format,
            uint len,
            int volume
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_OpenAudio(
            ref SDL_AudioSpec desired,
            out SDL_AudioSpec obtained
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_OpenAudio(
            ref SDL_AudioSpec desired,
            IntPtr obtained
        );

        /* uint refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, EntryPoint = "SDL_OpenAudioDevice", CallingConvention = CallingConvention.Cdecl)]
        private static extern uint INTERNAL_SDL_OpenAudioDevice(
            byte[] device,
            int iscapture,
            ref SDL_AudioSpec desired,
            out SDL_AudioSpec obtained,
            int allowed_changes
        );
        public static uint SDL_OpenAudioDevice(
            string device,
            int iscapture,
            ref SDL_AudioSpec desired,
            out SDL_AudioSpec obtained,
            int allowed_changes
        )
        {
            return INTERNAL_SDL_OpenAudioDevice(
                UTF8_ToNative(device),
                iscapture,
                ref desired,
                out obtained,
                allowed_changes
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_PauseAudio(int pause_on);

        /* dev refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_PauseAudioDevice(
            uint dev,
            int pause_on
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnlockAudio();

        /* dev refers to an SDL_AudioDeviceID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_UnlockAudioDevice(uint dev);

        /* dev refers to an SDL_AudioDeviceID, data to a void* */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_QueueAudio(
            uint dev,
            IntPtr data,
            UInt32 len
        );

        /* dev refers to an SDL_AudioDeviceID, data to a void* */
        /* Only available in 2.0.5 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_DequeueAudio(
            uint dev,
            IntPtr data,
            uint len
        );

        /* dev refers to an SDL_AudioDeviceID */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetQueuedAudioSize(uint dev);

        /* dev refers to an SDL_AudioDeviceID */
        /* Only available in 2.0.4 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_ClearQueuedAudio(uint dev);

        /* src_format and dst_format refer to SDL_AudioFormats.
		 * IntPtr refers to an SDL_AudioStream*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_NewAudioStream(
            ushort src_format,
            byte src_channels,
            int src_rate,
            ushort dst_format,
            byte dst_channels,
            int dst_rate
        );

        /* stream refers to an SDL_AudioStream*, buf to a void*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_AudioStreamPut(
            IntPtr stream,
            IntPtr buf,
            int len
        );

        /* stream refers to an SDL_AudioStream*, buf to a void*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_AudioStreamGet(
            IntPtr stream,
            IntPtr buf,
            int len
        );

        /* stream refers to an SDL_AudioStream*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_AudioStreamAvailable(IntPtr stream);

        /* stream refers to an SDL_AudioStream*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_AudioStreamClear(IntPtr stream);

        /* stream refers to an SDL_AudioStream*.
		 * Only available in 2.0.7
		 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_FreeAudioStream(IntPtr stream);

        #endregion

        #region SDL_timer.h

        /* System timers rely on different OS mechanisms depending on
		 * which operating system SDL2 is compiled against.
		 */

        /* Compare tick values, return true if A has passed B. Introduced in SDL 2.0.1,
		 * but does not require it (it was a macro).
		 */
        public static bool SDL_TICKS_PASSED(UInt32 A, UInt32 B)
        {
            return ((Int32)(B - A) <= 0);
        }

        /* Delays the thread's processing based on the milliseconds parameter */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_Delay(UInt32 ms);

        /* Returns the milliseconds that have passed since SDL was initialized */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt32 SDL_GetTicks();

        /* Get the current value of the high resolution counter */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt64 SDL_GetPerformanceCounter();

        /* Get the count per second of the high resolution counter */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern UInt64 SDL_GetPerformanceFrequency();

        /* param refers to a void* */
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate UInt32 SDL_TimerCallback(UInt32 interval, IntPtr param);

        /* int refers to an SDL_TimerID, param to a void* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_AddTimer(
            UInt32 interval,
            SDL_TimerCallback callback,
            IntPtr param
        );

        /* id refers to an SDL_TimerID */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_RemoveTimer(int id);

        #endregion

        #region SDL_system.h

        /* Windows */

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate IntPtr SDL_WindowsMessageHook(
            IntPtr userdata,
            IntPtr hWnd,
            uint message,
            ulong wParam,
            long lParam
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SetWindowsMessageHook(
            SDL_WindowsMessageHook callback,
            IntPtr userdata
        );

        /* iOS */

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate void SDL_iPhoneAnimationCallback(IntPtr p);

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_iPhoneSetAnimationCallback(
            IntPtr window, /* SDL_Window* */
            int interval,
            SDL_iPhoneAnimationCallback callback,
            IntPtr callbackParam
        );

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_iPhoneSetEventPump(SDL_bool enabled);

        /* Android */

        public const int SDL_ANDROID_EXTERNAL_STORAGE_READ = 0x01;
        public const int SDL_ANDROID_EXTERNAL_STORAGE_WRITE = 0x02;

        /* IntPtr refers to a JNIEnv* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_AndroidGetJNIEnv();

        /* IntPtr refers to a jobject */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_AndroidGetActivity();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsAndroidTV();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsChromebook();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsDeXMode();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_AndroidBackButton();

        [DllImport(nativeLibName, EntryPoint = "SDL_AndroidGetInternalStoragePath", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_AndroidGetInternalStoragePath();

        public static string SDL_AndroidGetInternalStoragePath()
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_AndroidGetInternalStoragePath()
            );
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_AndroidGetExternalStorageState();

        [DllImport(nativeLibName, EntryPoint = "SDL_AndroidGetExternalStorageState", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_AndroidGetExternalStoragePath();

        public static string SDL_AndroidGetExternalStoragePath()
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_AndroidGetExternalStoragePath()
            );
        }

        /* WinRT */

        public enum SDL_WinRT_DeviceFamily
        {
            SDL_WINRT_DEVICEFAMILY_UNKNOWN,
            SDL_WINRT_DEVICEFAMILY_DESKTOP,
            SDL_WINRT_DEVICEFAMILY_MOBILE,
            SDL_WINRT_DEVICEFAMILY_XBOX
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_WinRT_DeviceFamily SDL_WinRTGetDeviceFamily();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_IsTablet();

        #endregion

        #region SDL_syswm.h

        public enum SDL_SYSWM_TYPE
        {
            SDL_SYSWM_UNKNOWN,
            SDL_SYSWM_WINDOWS,
            SDL_SYSWM_X11,
            SDL_SYSWM_DIRECTFB,
            SDL_SYSWM_COCOA,
            SDL_SYSWM_UIKIT,
            SDL_SYSWM_WAYLAND,
            SDL_SYSWM_MIR,
            SDL_SYSWM_WINRT,
            SDL_SYSWM_ANDROID,
            SDL_SYSWM_VIVANTE,
            SDL_SYSWM_OS2
        }

        // FIXME: I wish these weren't public...
        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_windows_wminfo
        {
            public IntPtr window; // Refers to an HWND
            public IntPtr hdc; // Refers to an HDC
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_winrt_wminfo
        {
            public IntPtr window; // Refers to an IInspectable*
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_x11_wminfo
        {
            public IntPtr display; // Refers to a Display*
            public IntPtr window; // Refers to a Window (XID, use ToInt64!)
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_directfb_wminfo
        {
            public IntPtr dfb; // Refers to an IDirectFB*
            public IntPtr window; // Refers to an IDirectFBWindow*
            public IntPtr surface; // Refers to an IDirectFBSurface*
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_cocoa_wminfo
        {
            public IntPtr window; // Refers to an NSWindow*
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_uikit_wminfo
        {
            public IntPtr window; // Refers to a UIWindow*
            public uint framebuffer;
            public uint colorbuffer;
            public uint resolveFramebuffer;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_wayland_wminfo
        {
            public IntPtr display; // Refers to a wl_display*
            public IntPtr surface; // Refers to a wl_surface*
            public IntPtr shell_surface; // Refers to a wl_shell_surface*
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_mir_wminfo
        {
            public IntPtr connection; // Refers to a MirConnection*
            public IntPtr surface; // Refers to a MirSurface*
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_android_wminfo
        {
            public IntPtr window; // Refers to an ANativeWindow
            public IntPtr surface; // Refers to an EGLSurface
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INTERNAL_vivante_wminfo
        {
            public IntPtr display; // Refers to an EGLNativeDisplayType
            public IntPtr window; // Refers to an EGLNativeWindowType
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct INTERNAL_SysWMDriverUnion
        {
            [FieldOffset(0)]
            public INTERNAL_windows_wminfo win;
            [FieldOffset(0)]
            public INTERNAL_winrt_wminfo winrt;
            [FieldOffset(0)]
            public INTERNAL_x11_wminfo x11;
            [FieldOffset(0)]
            public INTERNAL_directfb_wminfo dfb;
            [FieldOffset(0)]
            public INTERNAL_cocoa_wminfo cocoa;
            [FieldOffset(0)]
            public INTERNAL_uikit_wminfo uikit;
            [FieldOffset(0)]
            public INTERNAL_wayland_wminfo wl;
            [FieldOffset(0)]
            public INTERNAL_mir_wminfo mir;
            [FieldOffset(0)]
            public INTERNAL_android_wminfo android;
            [FieldOffset(0)]
            public INTERNAL_vivante_wminfo vivante;
            // private int dummy;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SDL_SysWMinfo
        {
            public SDL_version version;
            public SDL_SYSWM_TYPE subsystem;
            public INTERNAL_SysWMDriverUnion info;
        }

        /* window refers to an SDL_Window* */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_GetWindowWMInfo(
            IntPtr window,
            ref SDL_SysWMinfo info
        );

        #endregion

        #region SDL_filesystem.h

        /* Only available in 2.0.1 */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetBasePath", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetBasePath();
        public static string SDL_GetBasePath()
        {
            return UTF8_ToManaged(INTERNAL_SDL_GetBasePath(), true);
        }

        /* Only available in 2.0.1 */
        [DllImport(nativeLibName, EntryPoint = "SDL_GetPrefPath", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr INTERNAL_SDL_GetPrefPath(
            byte[] org,
            byte[] app
        );
        public static string SDL_GetPrefPath(string org, string app)
        {
            return UTF8_ToManaged(
                INTERNAL_SDL_GetPrefPath(
                    UTF8_ToNative(org),
                    UTF8_ToNative(app)
                ),
                true
            );
        }

        #endregion

        #region SDL_power.h

        public enum SDL_PowerState
        {
            SDL_POWERSTATE_UNKNOWN = 0,
            SDL_POWERSTATE_ON_BATTERY,
            SDL_POWERSTATE_NO_BATTERY,
            SDL_POWERSTATE_CHARGING,
            SDL_POWERSTATE_CHARGED
        }

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_PowerState SDL_GetPowerInfo(
            out int secs,
            out int pct
        );

        #endregion

        #region SDL_cpuinfo.h

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetCPUCount();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetCPUCacheLineSize();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasRDTSC();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasAltiVec();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasMMX();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_Has3DNow();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasSSE();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasSSE2();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasSSE3();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasSSE41();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasSSE42();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasAVX();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasAVX2();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasAVX512F();

        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern SDL_bool SDL_HasNEON();

        /* Only available in 2.0.1 */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern int SDL_GetSystemRAM();

        /* Only available in SDL 2.0.10 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern uint SDL_SIMDGetAlignment();

        /* Only available in SDL 2.0.10 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr SDL_SIMDAlloc(uint len);

        /* Only available in SDL 2.0.10 or higher. */
        [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SDL_SIMDFree(IntPtr ptr);

        #endregion
    }
}
